Sayyidina Ikrimah reported that Sayyidina Ibn Abbas (RA) was told after a salah of fajr that a certain wife of the Prophet ﷺ had died. He went down into prostration. Someone asked him, “Do you make prostration at this time?” He said, “Has not Allah’s Messenger ﷺ said, ‘When you see a sign, go down into prostration.’ So, which sign is greater than the departure of the wives of the Prophet ﷺ ?" [Abu Dawud 1197]