Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Noble Prophet (peace and blessings be upon him) used to recite «سَبِّحِ اسْمَ رَبِّكَ الْأَعْلَى», «قُلْ يَا أَيُّهَا الْكَافِرُونَ», and «قُلْ هُوَ اللَّهُ أَحَدٌ» in the three rak‘ahs of Witr.