It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) from the Messenger of Allah (peace and blessings be upon him) that he (peace and blessings be upon him) said: "There is no servant from whom a sin has not issued or who has not intended a sin, except Yahya bin Zakariyya; he neither erred nor intended a sin."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20748