Mishkat al-Masabih
He reported God’s messenger as saying, “If anyone performs the pilgrimage for God’s sake without talking immodestly or acting wickedly, he will return [free from sin] as on the day his mother bore him.” Bukhari and Muslim.
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: «مِنْ حَجَّ فَلَمْ يَرْفُثْ وَلَمْ يَفْسُقْ رَجَعَ كَيَوْمِ وَلَدَتْهُ أمه»
Reference