During the two Rak'ah of Tawaf, the Messenger of Allah recited the two Surat of Ikhlas, "Say: O you disbelievers!" and: "Say: He is Allah, (the) One."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَرَأَ فِي رَكْعَتَىِ الطَّوَافِ بِسُورَتَىِ الإِخْلاَصِْ ( قُلْ يَا أَيُّهَا الْكَافِرُونَ ) وَ ( قُلْ هُوَ اللَّهُ أَحَدٌ )  

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."  

أَنْ يَقْرَأَ فِي رَكْعَتَىِ الطَّوَافِ بِ ( قُلْ يَا أَيُّهَا الْكَافِرُونَ ) وَ ( قُلْ هُوَ اللَّهُ أَحَدٌ )