It was narrated that Ibn Sirin said: "A funeral passed by Al-Hasan bin 'Ali and Ibn 'Abbas. Al-Hasan stood up but Ibn 'Abbas did not. Al-Hasan said to Ibn 'Abbas: “Didn't the Messengr of Allah stand up for it?' Ibn 'Abbas said: “He stood up for it then he sat””"
Sahih IsnaadSahih IsnaadSahihBook 21 · Hadith 108