ON MOURNING

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"  -Imam Sadiq (A.S.) 

Bihar al‑Anwar vol: 22 , pg. : 157.