مناسك حج - مكارم شيرازى، ناصر - الصفحة ٥٩ - Process of Ihram

Article ٧٤- Twenty- five acts, which are Haraam for Muhrim, are not Haraam for him/ her before saying" Labbayk" even if he/ she has made the intention and has worn the clothing of Ihram; therefore, it has no atonement if the pilgrim performs one of the acts that are Haraam for Muhrim before saying Labbayk; in fact," Labbayk" is like" Allahu Akbar" at the beginning of the prayer that a Muhrim does not enter the state of prayer before saying that, and whenever a pilgrim has doubt that if he/ she has said" Labbayk" or not, nothing is also Haraam for him from the prohibited acts of a Muhrim.

Article ٧٥- Whenever a pilgrim is in Miqat and has doubt that if he/ she has said Labbayk or not, then he/ she should say the Labbayk and if he/ she has passed Miqat the he/ she can return to Miqat and say it as a precaution and if it is not possible to return then he/ she should say it in that place, but if the pilgrim do not know that if he/ she has said Labbayk correctly or not, then he/ she should consider it as correct and his/ her Ihram is correct.