It was narrated from Ibn 'Umar, that 'Umar had vowed to spend a night in 'Itikaf during the Jahiliyyah. He asked the Messenger of Allah about that, and he ordered him to perform the 'Itikaf.  

أَنَّهُ كَانَ عَلَيْهِ لَيْلَةٌ نَذَرَ فِي الْجَاهِلِيَّةِ يَعْتَكِفُهَا فَسَأَلَ رَسُولَ اللَّهِ ﷺ فَأَمَرَهُ أَنْ يَعْتَكِفَ  

"Umar had made a vow to spend a night in 'Itikaf in Al-Masjid Al-Haram. He asked the Messenger of Allah about that, and he ordered him to perform the 'Itikaf."  

كَانَ عَلَى عُمَرَ نَذْرٌ فِي اعْتِكَافِ لَيْلَةٍ فِي الْمَسْجِدِ الْحَرَامِ فَسَأَلَ رَسُولَ اللَّهِ ﷺ عَنْ ذَلِكَ فَأَمَرَهُ أَنْ يَعْتَكِفَ  

It was narrated from Ibn 'Umar that 'Umar had vowed -during the Jahiliyyah- to spend a day in 'Itikaf. He asked the Messenger of Allah about that, and he commanded him to perform the 'Itikaf.  

أَنَّ عُمَرَ كَانَ جَعَلَ عَلَيْهِ يَوْمًا يَعْتَكِفُهُ فِي الْجَاهِلِيَّةِ فَسَأَلَ رَسُولَ اللَّهِ ﷺ عَنْ ذَلِكَ فَأَمَرَهُ أَنْ يَعْتَكِفَهُ  

"O Messenger of Allah! I want to give all my wealth in charity for Allah and His Messenger." The Messenger of Allah said to him: "Keep some of your wealth for yourself; that is better for you."  

أَنَّهُ قَالَ لِرَسُولِ اللَّهِ ﷺ حِينَ تِيبَ عَلَيْهِ يَا رَسُولَ اللَّهِ إِنِّي أَنْخَلِعُ مِنْ مَالِي صَدَقَةً إِلَى اللَّهِ وَرَسُولِهِ فَقَالَ لَهُ رَسُولُ اللَّهِ ﷺ أَمْسِكْ عَلَيْكَ بَعْضَ مَالِكَ فَهُوَ خَيْرٌ لَكَ قَالَ أَبُو عَبْدِ الرَّحْمَنِ يُشْبِهُ أَنْ يَكُونَ الزُّهْرِيُّ سَمِعَ هَذَا الْحَدِيثَ مِنْ عَبْدِ اللَّهِ بْنِ كَعْبٍ وَمِنْ عَبْدِ الرَّحْمَنِ عَنْهُ فِي هَذَا الْحَدِيثِ الطَّوِيلِ تَوْبَةُ كَعْبٍ