During the lifetime of Messenger of Allah ﷺ, some men among the hypocrites used to remain behind him (i.e. did not accompany him) when he went out for a Ghazwa and they would be pleased to stay at home behind Messenger of Allah ﷺ When Messenger of Allah ﷺ returned (from the battle) they would put forward (false) excuses and take oaths, wishing to be praised for what they had not done. So there was revealed:-- "Think not that those who rejoice in what they have done, and love to be praised for what they have not done.." (3.188)  

عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ ؓ أَنَّ رِجَالاً مِنَ الْمُنَافِقِينَ عَلَى عَهْدِ رَسُولِ اللَّهِ ﷺ كَانَ إِذَا خَرَجَ رَسُولُ اللَّهِ ﷺ إِلَى الْغَزْوِ تَخَلَّفُوا عَنْهُ وَفَرِحُوا بِمَقْعَدِهِمْ خِلاَفَ رَسُولِ اللَّهِ ﷺ فَإِذَا قَدِمَ رَسُولُ اللَّهِ ﷺ اعْتَذَرُوا إِلَيْهِ وَحَلَفُوا وَأَحَبُّوا أَنْ يُحْمَدُوا بِمَا لَمْ يَفْعَلُوا فَنَزَلَتْ {لاَ يَحْسِبَنَّ الَّذِينَ يَفْرَحُونَ} الآيَةَ  

[Machine] "There were men among the hypocrites during the time of the Messenger of Allah ﷺ who, when the Prophet ﷺ went out for battle, would lag behind and rejoice in their seats, opposing the Messenger of Allah ﷺ . But when the Messenger of Allah ﷺ returned, they would apologize to him, swear oaths, and pretend to love to be praised for what they had not done. Then the verse {Do not think that those who rejoice in what they have perpetrated} was revealed."  

«أَنَّ رِجَالًا مِنَ الْمُنَافِقِينَ فِي عَهْدِ رَسُولِ اللَّهِ ﷺ كَانَ إِذَا خَرَجَ النَّبِيُّ ﷺ إِلَى الْغَزْوِ وَتَخَلَّفُوا عَنْهُ وَفَرِحُوا بِمَقْعَدِهِمْ خِلَافَ رَسُولِ اللَّهِ ﷺ فَإِذَا قَدِمَ رَسُولُ اللَّهِ ﷺ اعْتَذَرُوا إِلَيْهِ وَحَلَفُوا وَأَحَبُّوا أَنْ يُحْمَدُوا بِمَا لَمْ يَفْعَلُوا فَنَزَلَ {لَا تَحْسَبَنَّ الَّذِينَ يَفْرَحُونَ بِمَا أَتَوْا} »