《新唐书·列传·卷一百二十七》
当时宋若思率领吴兵三千赴河南，经过寻阳，放了白并召他为参谋，不久即辞职。
时宋若思将吴兵三千赴河南，道寻阳，释囚辟为参谋，未几辞职。
At that time, Song Ruisi was leading three thousand Wu soldiers to Henan, passing by Xunyang, and he released Bai and invited him to be his adviser, but Bai resigned shortly after.