Muhammad bin Abdullah bin Ja'far (may Allah have mercy on him) relates: I was with Sayyiduna Abdullah bin Ja'far (may Allah be pleased with them both) when a man came and said: Tell me some supplications by which Allah will benefit me. He said: Yes. I heard the Messenger of Allah (peace and blessings be upon him) when a man asked him the same thing you have asked me, and he (peace and blessings be upon him) said: "Ask Allah for pardon and well-being in this world and the Hereafter."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13789