Hadith on Dhikr: Remembering Allah is easy, but many forget

Abdullah ibn Amr reported: The Prophet, peace and blessings be upon him, said, “There are two practices that will admit a Muslim into Paradise if he preserves them both. They are easy although there are few who practice them. It is to glorify Allah ten times, to praise Allah ten times, and to exalt Allah ten times at the end of every prayer, for it is one hundred and fifty upon the tongue but one thousand five hundred upon the scale. And it is to glorify Allah thirty three times, to praise Allah thirty three times, and to exalt Allah thirty four times before going to sleep, for it is one hundred upon the tongue and one thousand upon the scale. Which one of you could commit two thousand five hundred sins in a day?” They said, “O Messenger of Allah, how are they easy but few practice them?” The Prophet said, “Satan comes to one of you during prayer and incites him to remember a need, so he leaves the prayer without saying them. And Satan comes to him when he goes to bed and lulls him to sleep without saying them.

Source: Musnad Aḥmad 6871

Grade: Sahih (authentic) according to Ahmad Shakir

عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنَّهُ قَالَ خَصْلَتَانِ أَوْ خَلَّتَانِ لَا يُحَافِظُ عَلَيْهِمَا رَجُلٌ مُسْلِمٌ إِلَّا دَخَلَ الْجَنَّةَ هُمَا يَسِيرٌ وَمَنْ يَعْمَلُ بِهِمَا قَلِيلٌ تُسَبِّحُ اللَّهَ عَشْرًا وَتَحْمَدُ اللَّهَ عَشْرًا وَتُكَبِّرُ اللَّهَ عَشْرًا فِي دُبُرِ كُلِّ صَلَاةٍ فَذَلِكَ مِائَةٌ وَخَمْسُونَ بِاللِّسَانِ وَأَلْفٌ وَخَمْسُ مِائَةٍ فِي الْمِيزَانِ وَتُسَبِّحُ ثَلَاثًا وَثَلَاثِينَ وَتَحْمَدُ ثَلَاثًا وَثَلَاثِينَ وَتُكَبِّرُ أَرْبَعًا وَثَلَاثِينَ عَطَاءٌ لَا يَدْرِي أَيَّتُهُنَّ أَرْبَعٌ وَثَلَاثُونَ إِذَا أَخَذَ مَضْجَعَهُ فَذَلِكَ مِائَةٌ بِاللِّسَانِ وَأَلْفٌ فِي الْمِيزَانِ فَأَيُّكُمْ يَعْمَلُ فِي الْيَوْمِ أَلْفَيْنِ وَخَمْسَ مِائَةِ سَيِّئَةٍ قَالُوا يَا رَسُولَ اللَّهِ كَيْفَ هُمَا يَسِيرٌ وَمَنْ يَعْمَلُ بِهِمَا قَلِيلٌ قَالَ يَأْتِي أَحَدَكُمْ الشَّيْطَانُ إِذَا فَرَغَ مِنْ صَلَاتِهِ فَيُذَكِّرُهُ حَاجَةَ كَذَا وَكَذَا فَيَقُومُ وَلَا يَقُولُهَا فَإِذَا اضْطَجَعَ يَأْتِيهِ الشَّيْطَانُ فَيُنَوِّمُهُ قَبْلَ أَنْ يَقُولَهَا

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