Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "Any believer who keeps reciting the talbiyah from sunrise until sunset, his sins also come to an end with the setting of the sun, until he becomes as he was when his mother gave birth to him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9022