Muwatta Malik · Hadith 437

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، لَمْ يَكُنْ يُصَلِّي يَوْمَ الْفِطْرِ قَبْلَ الصَّلاَةِ وَلاَ بَعْدَهَا ‏.‏

Yahya related to me from Malik from Nafi that Abdullah ibn Umar did not pray either before the prayer or after it on the day of Fitr

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