Hadith 596
Ka'b bin 'Ujra reported Allah's Messenger (ﷺ) as saying: There are certain ejaculations, the repeaters of which or the performers of which after every prescribed prayer will never be caused disappointment: "Glory be to Allah" thirty-three times. "Praise be to Allah" thirty-three times, and "Allah is most Great" thirty-four times.
Hadith 672
This hadith has been narrated by Abu Sa'id al-Khudri by another chain of transmitters.
Hadith 947
'A'isha reported Allah's Apostle (ﷺ) saying: If a company of Muslims numbering one hundred pray over a dead person, all of them interceding for him, their intercession for him will be accepted.
Hadith 1476
The above hadith has likewise been narrated through another chain.