Ibn Asakir reported: Mujahid said, “I accompanied Ibn Umar, may Allah be pleased with him, on a journey that I might serve him, yet it was he who served me.”
Source: Tārīkh Dimashq 57/33
عن ابن عساكر عن مُجَاهِد قَالَ صَحِبْتُ ابْنَ عُمَرَ رضي الله عنه فِي السَّفَرِ لِأَخْدُمَهُ فَكَانَ يَخْدِمُنِي
57/33 تاريخ دمشق لابن عساكر