عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو رَضِيَ اللَّهُ عَنْهُمَا أَنَّ رَجُلًا قَالَ يَا رَسُولَ اللَّهِ أَيُّ الْإِسْلَامِ أَفْضَلُ قَالَ مَنْ سَلِمَ الْمُسْلِمُونَ مِنْ لِسَانِهِ وَيَدِهِ
It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that a man said: O Messenger of Allah! Which Islam is the best? The Prophet (peace and blessings be upon him) said: That person from whose tongue and hand other Muslims are safe.