Sayyidah Asma' bint Umays (may Allah be pleased with her) said: When Ja'far (may Allah be pleased with him) was martyred, the Messenger of Allah (peace and blessings be upon him) instructed me, saying: "Stay in for three days, then do as you wish."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20740