Mishkat al-Masabih #14
Faith
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
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. رَوَاهُ مُسلم
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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About Mishkat al-Masabih
This hadith is #14 from Mishkat al-Masabih, in the Book of Faith.