Some person was teaching his companions the rituals of Hajj and `Umrah but forgot to say Talbiyah for himself

A 1: If you had already made the intention for Hajj and you started the rituals at the Miqat, then your Hajj is valid, and you are not harmed because you failed to pronounce the intention to perform the rituals which you want to perform. This is because the pronunciation of one's intention is recommended but it is not an obligation.But, if you forgot to start the rituals and you did not make the intention until you had passed the Miqat, then you are required to offer Dam (atonement required of a pilgrim for a willful violation of a prohibition or obligation while in the ritual state for Hajj and 'Umrah), which is one seventh of a Badanah (a camel or a cow or an ox driven by pilgrims to be offered as sacrifice within the Sacred precincts of Makkah) or a sheep, meeting the same conditions for Ud-Hiyah (sacrificial animal offered by non-pilgrims), which should be slaughtered in Makkah and distributed to the poor of the Haram (all areas within the Sacred Sanctuary of Makkah). This is necessary because you abandoned an obligation; namely, the intention of starting the rituals at the Miqat. (Part No. 10; Page No. 139) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.