Hadith 2:141
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 { فَإِنْ كَانَ مَعَكَ قُرْآنٌ فَاقْرَأْ وَإِلَّا فَاحْمَدِ اَللَّهَ , وَكَبِّرْهُ , وهلِّلْهُ }