It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever performs Hajj to the House of Allah and commits no sexual misconduct or sin during the Hajj will return as on the day his mother gave birth to him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10385