وَعَن سُفْيَان بن عبد الله الثَّقَفِيّ
قَالَ: قُلْتُ: يَا رَسُولَ اللَّهِ قُلْ لِي فِي الْإِسْلَامِ قَوْلًا لَا أَسْأَلُ عَنْهُ أَحَدًا بَعْدَكَ وَفِي رِوَايَةٍ: غَيْرَكَ قَالَ: «قُلْ: آمَنْتُ بِاللَّه ثمَّ اسْتَقِم
He said, “Messenger of God, say something about Islam concerning which I shall need to ask no one after you are gone.” (A version has “anyone else”.) He said, “Say, ‘I believe in God’, then keep to the straight path.”
Mishkat al-Masabih 15, Book 2, Faith, Hadith 14. 1 min read