It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The people closest to me on the Day of Resurrection will be those who send the most blessings (salah) upon me."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9764