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Grade : Sahih (Al-Albani)
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا حَمَّادٌ، أَخْبَرَنَا ثَابِتٌ، عَنْ أَبِي رَافِعٍ، عَنْ أُبَىِّ بْنِ كَعْبٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يَعْتَكِفُ الْعَشْرَ الأَوَاخِرَ مِنْ رَمَضَانَ فَلَمْ يَعْتَكِفْ عَامًا فَلَمَّا كَانَ الْعَامُ الْمُقْبِلُ اعْتَكَفَ عِشْرِينَ لَيْلَةً .
Narrated Ubayy ibn Ka'b: The Prophet (ﷺ) used to observe i'tikaf during the last ten days of Ramadan. One year he did not observe i'tikaf. When the next year came, he observed i'tikaf for twenty nights (i.e. days)
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari