Ibn Buraydah narrated from his father, who said: I have not heard anything about the tashahhud better than the hadith of Sayyiduna Ibn Mas'ud (may Allah be pleased with him), because he traced it back to the Prophet (peace and blessings be upon him) (narrated it as marfu').
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9847