(233) Chapter: The Obligation of Hajj (Pilgrimage) and its Excellence

As-Sai'b bin Yazid (May Allah be pleased with him) reported:
I was seven years old when I was taken to perform Hajj (pilgrimage). This was during the time the Messenger of Allah (ﷺ) performed the Hajjat-ul-Wada' (Farewell Pilgrimage).

[Al- Bukhari].

Commentary: This Hadith points out the fact that it is permissible to take children to Hajj. The reward of their Hajj will be given to their parents. But when after attaining maturity the child becomes liable for Hajj, it will be necessary for him to perform it again because the one he has performed in childhood, will not be sufficient for him. The reason behind taking children to Hajj is to teach them how to perform this obligation.