´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."'
Hadith Referenceسنن نسائي / كتاب الجنائز / 1926
Hadith Gradingالألبانی:صحيح الإسناد | زبیر علی زئی:صحيح
Hadith Takhrij«انظر ماقبلہ (صحیح الإسناد)»
Brief Explanation
1؎: The majority have deduced from this that the narration regarding standing has been abrogated. It is also possible that the Prophet’s not standing was to indicate permissibility. And Allah knows best.