عَنِ ابْنِ مَسْعُودٍ رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ وَالَّذِي نَفْسِي بِيَدِهِ لَا يُسْلِمُ عَبْدٌ حَتَّى يَسْلَمَ قَلْبُهُ وَلِسَانُهُ
It is narrated from Sayyiduna Abdullah bin Masood (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "By Him in Whose hand is my soul! A servant does not become a Muslim until his heart and tongue become ones of peace."