It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever performs Hajj to this House and does not engage in sexual relations and does not commit any sinful deed will return like the day his mother gave birth to him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9168