Mishkat al-Masabih 15

Translation

Sufyan b. ‘Abdallah ath-Thaqafi reported that 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.” Muslim transmitted it.

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Same hadith, other wordings

• Shahih Muslim 38قُلْتُ: يَا رَسُولَ اللَّهِ قُلْ لِي فِي الإِسْلاَمِ قَوْلاً لاَ أَسْأَلُ عَنْهُ أَحَدًا بَعْدَكَ؟ – وَفِي حَدِيثِ أَبِي أُسَامَةَ: غَيْرَكَ – قَالَ: «قُلْ آمَنْتُ بِاللَّهِ فَاسْتَقِمْ».