Examples of deeds for which the angels send blessings upon a person
(A) Teaching people good things
At-Tirmidhi narrated in his Sunan from Abu Umamah that the Messenger (ﷺ) said:
Allah and His angels, and the inhabitants of the heavens and the earth, even the ant in its hole, and even the fish, send blessings upon the one who teaches the people good things.
Saheeh Sunan at-Tirmidhi, 2/343, no. 2161
(B) Those who wait for prayer in congregation
In Saheeh Muslim it is narrated that Abu Hurayrah said: The Messenger of Allah (ﷺ) said:
The angels send blessings on any one of you so long as he stays where he is sitting. They say: "O Allah, forgive him, O Allah, have mercy on him, so long as he does not break his wudoo."
Bukhari, 2/131, hadith no. 647. Also narrated by Muslim, 1/459, hadith no. 639.
(C) Those who pray in the first row
In Sunan Abi Dawood it is narrated from al-Bara' in 'Azib that the Messenger of Allah (ﷺ ) said: «Allah and His angels send blessings on the first rows.»
Saheeh Sunan Abi Däwood, 1/120, no. 618.
(D) Those who fill the gaps in the rows
In Sunan In Majah it is narrated that A 'ishah said; «The Messenger of Allah (ﷺ ) said:
Allah and His angels send blessings on those who complete the rows, and whoever fills a gap (in a row), Allah will raise his status because of it.»
Saheeh Sunan In Majah, 1/164, no. 814.
In Saheeh In Hibbän and Mu 'jam at-Tabarâni al-Awsar it is narrated with a hasan isnad from In Umar that the Messenger of Allah (ﷺ ) said: «Allah and His angels send blessings upon those who eat suhoor.»
(E) Those who send blessings upon the Prophet (ﷺ)
Ahmad narrated in his Musnad and ad-Diya' narrated in al-Mukhtärah from Amir ibn Rabe' ah with a hasan isnâd that the Messenger of Allah (ﷺ) said:
«There is no person who sends blessings on me, but the angels send blessings on him so long as he sends blessings on me. So let a person do a little of that or a lot.»