It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her); she said: When Sayyiduna Abu Salamah (may Allah be pleased with him) passed away, I prepared to weep. The Messenger of Allah (peace and blessings be upon him) said: "What are you about to do?" I said: O Messenger of Allah, I am weeping over Abu Salamah. He (peace and blessings be upon him) said: "Do not do so, for whatever the family of the deceased pray for, they are granted."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20131