Hadith on Taqwa: Be mindful of Allah as it is sum of all good

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, as it is the sum of all good. You must wage jihad in the way of Allah, as it is the monasticism of the Muslims. You must remember Allah and recite his book, as it will be a light for you on earth and your mention in the heavens. You must hold your tongue except for what is good, as by it you will defeat Satan.”

Source: al-Mu’jam al-Ṣaghīr 947

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

947 المعجم الصغير للطبراني

2869 المحدث الألباني خلاصة حكم المحدث صحيح لغيره في صحيح الترغيب