It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Noble Prophet, peace and blessings be upon him, asked: "Where is such-and-such a person?" One of those present mentioned him with bad words, saying he is such and such. The Noble Prophet, peace and blessings be upon him, said: "Was he not present at Badr?" It was submitted: Indeed, he participated. He said: "Allah Almighty was aware of the condition of the people of Badr and said: Do as you wish, I have forgiven you."
Hadith Referenceسنن دارمي / من كتاب الرقاق / 2796
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده حسن من أجل عاصم بن بهدلة، [مكتبه الشامله نمبر: 2803]
Hadith Takhrijاس حدیث کی سند عاصم بن بہدلہ کی وجہ سے حسن ہے۔ دیکھئے: [أبوداؤد 4654] ، [أحمد 295/2] ، [أبويعلی 394] ، [ابن حبان 4699] ، [موارد الظمآن 2220] ، [الحميدي 49]
Brief Explanation
(Commentary on Hadith 2795)
That is, even if sins were committed by them, they will be forgiven, because this was the first major confrontation between Islam and disbelief, which is also called the Day of Criterion (Yawm al-Furqan). Truth and falsehood became clear in it; therefore, the Companions (radi Allahu anhum) who participated in it possess great virtue.