‘Abd Allaah bin Mas’ud said “Fosterage is not valid except by what strengthens love and grows flesh.” Abu Musa said “Do not ask us so long as this learned man is among us”
لاَ رِضَاعَ إِلاَّ مَا شَدَّ الْعَظْمَ وَأَنْبَتَ اللَّحْمَ فَقَالَ أَبُو مُوسَى لاَ تَسْأَلُونَا وَهَذَا الْحَبْرُ فِيكُمْ