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 وَالْبُشْرَى فِي وَجْهِهِ فَقُلْنَا إِنَّا لَنَرَى الْبُشْرَى فِي وَجْهِكَ فَقَالَ إِنَّهُ أَتَانِي الْمَلَكُ فَقَالَ يَا مُحَمَّدُ إِنَّ رَبِّكَ يَقُولُ أَمَّا يُرْضِيكَ أَنَّهُ لَا يُصَلِّي عَلَيْكَ أَحَدٌ إِلَّا صَلَّيْتُ عَلَيْهِ عَشْرًا وَلَا يُسَلِّمُ عَلَيْكَ أَحَدٌ إِلَّا سَلَّمْتُ عَلَيْهِ عَشْرًا