عَنْ أَبِي مُوسَى الْأَشْعَرِيِّ رَضِيَ اللَّهُ عَنْهُ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ إِذَا بَعَثَ أَحَدًا مِنْ أَصْحَابِهِ فِي بَعْضِ أَمْرِهِ قَالَ: ((بَشِّرُوا وَلَا تُنَفِّرُوا وَيَسِّرُوا وَلَا تُعَسِّرُوا))
It is narrated from Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him), he says: Whenever the Messenger of Allah (peace and blessings be upon him) would send any of his companions for a task, he would say: “(When inviting people to Islam) give glad tidings and do not make them averse, and make things easy and do not create difficulties (in the religion).”