Sahih Muslim
The Book Pertaining to Paradise, Its Description, Its Bounties and Its Intimates (Kitab Al-Jannat wa Sifat Naimiha wa Ahliha)
Book Number: 040 / Hadith Number: 6870
Aba Talha reported: When it was the Day of Badr and Allah's Apostle (may peace be upon him) had gained victory over them (the Meccans), he commanded more than twenty persons, and in another hadith these are counted as twenty-four persons, from the non-believers of the Quraish to be thrown into the well of Badr. The rest of the hadith is the same.