Narrated by Abd-Allaah ibn ‘Amr رضي الله عنه said: “The Messenger of Allaah صلى الله عليه وسلم said: ‘There are two qualities, no Muslim man acquires them but he will enter Paradise, and they are simple and easy. He should glorify Allaah (say Subhaan Allaah) ten times immediately after each prayer, and praise Him (say Al-hamdu Lillaah) ten times and magnify Him (say Allaahu akbar) ten times.’

I saw the Messenger of Allaah صلى الله عليه وسلم counting this on his fingers. He said: ‘That makes one hundred and fifty on the tongue, and one thousand five hundred (hasanaat) in the scales.

[Translator’s note: each of three phrases repeated ten times makes thirty; multiplied by the number of daily prayers, which is five, makes one hundred and fifty. Each of these good deeds of the tongue will be rewarded with ten hasanaat which will be added to the total of good deeds to be weighed in the balance or scales on the Day of Judgement].

When you go to bed, glorify Him and praise Him and magnify Him one hundred times: that will be one hundred on the tongue and a thousand in the scales. Who among you does two thousand and five hundred sayi’aat (bad deeds) in one day?’ They said: ‘How could we not count (our sins)?’ He said: ‘The Shaytaan comes to any one of you whilst he is praying and says, Remember this, remember that, until he finishes his prayer and does not do (this dhikr), or he comes to him when he is lying down and makes him sleepy, until he falls asleep (without doing this dhikr).'”

Sunan al-Tirmidhi, 3332