Muwatta Malik · Hadith 1478

وَحَدَّثَنِي مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّهُ أَعْتَقَ وَلَدَ زِنًا وَأُمَّهُ ‏.‏

Malik related to me from Nafi that Abdullah ibn Umar freed an illegitimate child and its mother

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).