I said: "O Messenger of Allah! Inform me about a matter that I may hold fast to." He said: 'Say: My Lord is Allah, then be steadfast.' I said: "O Messenger of Allah! What do you fear most for me?" So he took hold of his tongue and said: 'This.'" (Using translation from Tirmidhī 2410)
قُلْتُ يَا رَسُولَ اللهِ حَدِّثْنِي بِأَمْرٍ أَعْتَصِمُ بِهِ قَالَ قُلْ رَبِّيَ اللهُ ثُمَّ اسْتَقِمْ قَالَ قُلْتُ يَا رَسُولَ اللهِ مَا أَخْوَفُ مَا تَخَافُ عَلَيَّ؟ قَالَ فَأَخَذَ بِلِسَانِ نَفْسِهِ ثُمَّ قَالَ هَذَا