Imam Sadiq (A.S.) said:
When Ibrahim, the son of the Holy Prophet (S.A.W.) died, tears filled the eyes of the Holy Prophet (S.A.W), whereupon he said, " The eyes are tearful and the heart is anguished (but) we shall not say anything which shall anger the Lord. Surely we, O' Ibrahim, are grief‑stricken for you"
Bihar al‑Anwar vol: 22 , pg. : 157.