Tawaaf or circumambulation of the Ka’bah is a pure act of worship and the basic principle with regard to acts of worship is tawqeef (i.e., to do them exactly as prescribed in the Qur'aan and Sunnah). It is proven from the Messenger of Allah (blessings and peace of Allah be upon him) that he used to say takbeer in his tawaaf every time he came in line with the Black Stone, and undoubtedly the person who is doing tawaaf comes in line with it at the end of the seventh circuit, so it is Sunnah for him to say takbeer just as it is Sunnah for him to say takbeer at the beginning of every circuit when he comes in line with it, following the example of the Messenger of Allah (blessings and peace of Allah be upon him), along with pointing at the Black Stone and kissing it if he can.
And Allah is the source of strength. May Allaah send blessings and peace upon our Prophet Muhammad and his family and companions. End quote.
Shaykh ‘Abd al-‘Azeez ibn ‘Abd-Allaah ibn Baaz, Shaykh ‘Abd al-Razzaaq al-‘Afeefi