Jabir bin Abdullah narrated:
During the two Rak'ah of Tawaf, the Messenger of Allah (ﷺ) recited the two Surat of Ikhlas, "Say: O you disbelievers!" and: "Say: He is Allah, (the) One."
Ja'far bin Muhammad narrated from his father:
that he considered it recommended for the two Rak'ah of Tawaf to recite: Say: "O you disbelievers!" and: Say: "He is Allah, (the) One."