Sayyiduna Abdullah bin Salam (may Allah be pleased with him) said: "By the One in whose hand is my soul, on the Day of Resurrection the closest of people will be Muhammad (peace and blessings be upon him), who will be seated on the Kursi at His (Allah's) right."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13999