Read all Ahadith in the book of al- maghazi by sahih al bukhari

Narrated Abu 'Is-haq: Once, while I was sitting beside Zaid bin Al-Arqam, he was asked, How many Ghazwat did the Prophet undertake? Zaid replied, Nineteen. They said, In how many Ghazwat did you join him? He replied, Seventeen. I asked, Which of these was the first? He replied, Al-`Ashira or Al- `Ashiru.

Narrated `Abdullah bin Mas`ud: From Sa`d bin Mu`adh: Sa`d bin Mu`adh was an intimate friend of Umaiya bin Khalaf and whenever Umaiya passed through Medina, he used to stay with Sa`d, and whenever Sa`d went to Mecca, he used to stay with Umaiya. When Allah's Apostle arrived at Medina, Sa`d went to perform `Umra and stayed at Umaiya's home in Mecca. He said to Umaiya, Tell me of a time when (the Mosque) is empty so that I may be able to perform Tawaf around the Ka`ba. So Umaiya went with him about midday. Abu Jahl met them and said, O Abu Safwan! Who is this man accompanying you? He said, He is Sa`d. Abu Jahl addressed Sa`d saying, I see you wandering about safely in Mecca inspite of the fact that you have given shelter to the people who have changed their religion (i.e. became Muslims) and have claimed that you will help them and support them. By Allah, if you were not in the company of Abu Safwan, you would not be able to go your family safely. Sa`d, raising his voice, said to him, By Allah, if you should stop me from doing this (i.e. performing Tawaf) I would certainly prevent you from something which is more valuable for you, that is, your passage through Medina. On this, Umaiya said to him, O Sa`d do not raise your voice before Abu-l-Hakam, the chief of the people of the Valley (of Mecca). Sa`d said, O Umaiya, stop that! By Allah, I have heard Allah's Apostle predicting that the Muslim will kill you. Umaiya asked, In Mecca? Sa`d said, I do not know. Umaiya was greatly scared by that news. When Umaiya returned to his family, he said to his wife, O Um Safwan! Don't you know what Sa`d told me? She said, What has he told you? He replied, He claims that Muhammad has informed them (i.e. companions that they will kill me. I asked him, 'In Mecca?' He replied, 'I do not know. Then Umaiya added, By Allah, I will never go out of Mecca. But when the day of (the Ghazwa of) Badr came, Abu Jahl called the people to war, saying, Go and protect your caravan. But Umaiya disliked to go out (of Mecca). Abu Jahl came to him and said, O Abu Safwan! If the people see you staying behind though you are the chief of the people of the Valley, then they will remain behind with you. Abu Jahl kept on urging him to go until he (i.e. Umaiya) said, As you have forced me to change my mind, by Allah, I will buy the best camel in Mecca. Then Umaiya said (to his wife). O Um Safwan, prepare what I need (for the journey). She said to him, O Abu Safwan! Have you forgotten what your Yathribi brother told you? He said, No, but I do not want to go with them but for a short distance. So when Umaiya went out, he used to tie his camel wherever he camped. He kept on doing that till Allah caused him to be killed at Badr.

Narrated Ka`b bin Malik: I never failed to join Allah's Apostle in any of his Ghazawat except in the Ghazwa of Tabuk. However, I did not take part in the Ghazwa of Badr, but none who failed to take part in it, was blamed, for Allah's Apostle had gone out to meet the caravans of (Quraish, but Allah caused them (i.e. Muslims) to meet their enemy unexpectedly (with no previous intention) .

Narrated Ibn Masud: I witnessed Al-Miqdad bin Al-Aswad in a scene which would have been dearer to me than anything had I been the hero of that scene. He (i.e. Al-Miqdad) came to the Prophet while the Prophet was urging the Muslims to fight with the pagans. Al-Miqdad said, We will not say as the People of Moses said: Go you and your Lord and fight you two. (5.27). But we shall fight on your right and on your left and in front of you and behind you. I saw the face of the Prophet getting bright with happiness, for that saying delighted him.

Narrated Ibn `Abbas: On the day of the battle of Badr, the Prophet said, O Allah! I appeal to You (to fulfill) Your Covenant and Promise. O Allah! If Your Will is that none should worship You (then give victory to the pagans). Then Abu Bakr took hold of him by the hand and said, This is sufficient for you. The Prophet came out saying, Their multitude will be put to flight and they will show their backs. (54.45)

Narrated Ibn `Abbas: The believers who failed to join the Ghazwa of Badr and those who took part in it are not equal (in reward).

Narrated Al-Bara: I and Ibn `Umar were considered too young to take part in the battle of Badr.

Narrated Al-Bara: I and Ibn `Umar were considered too young (to take part) in the battle of Badr, and the number of the Emigrant warriors were over sixty (men) and the Ansar were over 249.

Narrated Al-Bara: The companions of (the Prophet) Muhammad who took part in Badr, told me that their number was that of Saul's (i.e. Talut's) companions who crossed the river (of Jordan) with him and they were over three-hundred-and-ten men. By Allah, none crossed the river with him but a believer. (See Qur'an 2:249)

Narrated Al-Bara: We, the Companions of Muhammad used to say that the number of the warriors of Badr was the same as the number of Saul's companions who crossed the river (of Jordan) with him, and none crossed the river with him but a believer, and the were over three-hundred-and-ten men.