It is also mentionmed in the same Hadith, "If you know any portion of the Qur'an, read it or else say:

Alhamdu lillah, Allahu Akbar and La ilaha ill-Allah."

وَفِيهَا [1]‏ { فَإِنْ كَانَ مَعَكَ قُرْآنٌ فَاقْرَأْ وَإِلَّا فَاحْمَدِ اَللَّهَ , وَكَبِّرْهُ , وهلِّلْهُ } [2]‏