The Messenger of Allah ﷺ came one day with a cheerful expression on his face, and we said: "We see you looking cheerful". He said: "The Angel came to me and said: 'O Muhammad, your Lord says: 'Will it not please you (to know) that no one will send salah upon you that I will send salah upon him tenfold, and no one will send salams upon you but I will send salams upon him tenfold?'" (Using translation from Nasāʾī 1283)
أَنَّ رَسُولَ اللهِ ﷺ جَاءَ ذَاتَ يَوْمٍ وَالْبِشْرُ يُرَى فِيوَجْهِهِ فَقُلْنَا إِنَّا لَنَرَى الْبِشْرَ فِي وَجْهِكَ فَقَالَ إِنَّهُ أَتَانِي مَلَكٌ فَقَالَ يَا مُحَمَّدُ إِنَّ رَبَّكَ يَقُولُ أَمَا يُرْضِيكَ أَنْ لَا يُصَلِّيَ عَلَيْكَ أَحَدٌ مِنْ أُمَّتِكَ إِلَّا صَلَّيْتُ عَلَيْهِ عَشْرًا وَلَا يُسَلِّمُ عَلَيْكَ إِلَّا سَلَّمْتُ عَلَيْهِ عَشْرًا