سنن النسائي

It was narrated that 'Abdullah bin Ja'far said: "The Messenger of Allah (ﷺ) [SAW] stayed away from the family of Ja'far (when he died) for three days, then he came to them, and said: 'Do not weep for my brother after today.' Then he said: 'Call my brother's sons to me.' We were brought like little chicks, and he said: 'Call the barber for me.' Then he ordered that our heads be shaved."