Narrator:Mu‘ādh ibn Jabal
عَن مُعَاذِ بْنِ جَبَلٍ قَالَ: «قَالَ لِي رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَفَاتِيحُ الْجَنَّةِ شَهَادَةُ أَنْ لَا إِلَه إِلَّا الله» . رَوَاهُ أَحْمد
Mu'adh b. Jabal reported that God’s messenger said to him, “The keys of paradise are the testimony that there is no god but God.” Ahmad transmitted it.
Cited in Mishkat al-Masabih (No. 40).