عَنْ مُعَاذِ بْنِ جَبَلٍ رَضِيَ اللَّهُ عَنْهُ أَنَّهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ مَا عَمِلَ آدَمِيٌّ عَمَلًا قَطُّ أَنْجَى لَهُ مِنْ عَذَابِ اللَّهِ مِنْ ذِكْرِ اللَّهِ وَقَالَ مُعَاذٌ رَضِيَ اللَّهُ عَنْهُ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَلَا أُخْبِرُكُمْ بِخَيْرِ أَعْمَالِكُمْ وَأَزْكَاهَا عِنْدَ مَلِيكِكُمْ وَأَرْفَعِهَا فِي دَرَجَاتِكُمْ وَخَيْرٍ لَكُمْ مِنْ تَعَاطِي الذَّهَبِ وَالْفِضَّةِ وَمِنْ أَنْ تَلْقَوْا عَدُوَّكُمْ غَدًا فَتَضْرِبُوا أَعْنَاقَهُمْ وَيَضْرِبُوا أَعْنَاقَكُمْ قَالُوا بَلَى يَا رَسُولَ اللَّهِ قَالَ ذِكْرُ اللَّهِ عَزَّ وَجَلَّ
It is narrated from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: The servant has not done any deed that saves him more from Allah's punishment than the remembrance of Allah. Furthermore, Sayyiduna Mu'adh (may Allah be pleased with him) states that the Messenger of Allah (peace and blessings be upon him) said: Shall I not inform you of such a deed which is the best, the purest in the sight of your Lord, the one that raises your ranks the most, better for you than giving gold and silver in charity, and better for you than meeting your enemies so that you strike their necks and they strike your necks? The Companions said: Why not, O Messenger of Allah! Do tell us. He (peace and blessings be upon him) said: That deed is the remembrance of Allah Almighty.