Abu Sa’id al-Khudri reported: A man came to the Messenger of Allah, peace and blessings be upon him, and he said, “O Messenger of Allah, instruct me.” The Prophet said, “You must fear Allah, for it is the sum of all good. You must wage jihad in the way of Allah, for it is the monasticism of the Muslims. You must remember Allah and recite His Book, for it will be your light upon the earth and your mention in the heavens. You must hold your tongue unless it is good, for by it you will defeat Satan.”
Source: al-Mu’jam al-Ṣaghīr lil-Ṭabarānī 949
Grade: Sahih li ghayrihi (authentic due to external evidence) according to Al-Albani
عَنْ أَبِي سَعِيدٍ قَالَ جَاءَ رَجُلٌ إِلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ فَقَالَ يَا رَسُولَ اللَّهِ أَوْصِنِي قَالَ عَلَيْكَ بِتَقْوَى اللَّهِ فَإِنَّهَا جِمَاعُ كُلِّ خَيْرٍ وَعَلَيْكَ بِالْجِهَادِ فِي سَبِيلِ اللَّهِ فَإِنَّهَا رَهْبَانِيَّةُ الْمُسْلِمِينَ وَعَلَيْكَ بِذِكْرِ اللَّهِ وَتِلاوَةِ كِتَابِهِ فَإِنَّهُ نُورٌ لَكَ فِي الأَرْضِ وَذِكْرٌ لَكَ فِي السَّمَاءِ وَاخْزُنْ لِسَانَكَ إِلا مِنْ خَيْرٍ فَإِنَّكَ بِذَلِكَ تَغْلِبُ الشَّيْطَانَ
949 المعجم الصغير للطبراني
2869 المحدث الألباني خلاصة حكم المحدث صحيح لغيره في صحيح الترغيب