Arabic hadith text
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّهُ كَانَ يَكْرَهُ الإِخْصَاءَ وَيَقُولُ فِيهِ تَمَامُ الْخَلْقِ ‏.‏
Translation

Yahya related to me from Malik from Nafi that Abdullah ibn Umardisapproved of castration and said, "The completeness of the createdform is in the testicles."