In this narration the words are: "Had he spoken about them, I would have released them," meaning the captives of Badr. Sufyan (may Allah have mercy on him) said: He had done the Prophet (peace and blessings be upon him) a favour, and he (peace and blessings be upon him) was the most generous of people in repaying a favour.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 12838