obligation of invoking Allah on behalf of the prophe

Narrated Ali ibn Abu-Taleb: the Messenger of Allah said: the miserly person is he, in whose presence I was mentioned, but he did not invoke Allah to shower of His mercy on me.
Narrated Abdullah ibn Masoud: the Messenger of Allah said: the worthiest people of me on the day of judgment are those who invoke the mercy of Allah for me much.
Amr ibn Malek Al-Janbiy said that he had heard Fadhala ibn Obayd saying: the Prophet heard a man invoking Allah without asking Allah to shower of His mercy on the Prophet. The Prophet said this person has hurried up in his invocation, the Prophet summoned the man and said to him or another person: if one of you invokes Allah, let him start with praising Allah the due praise and invoke Him to shower mercy on the Prophet then to invoke whatever he likes