Last 10 Days of Ramadhan

1) Night of al-Qadr (Lailatul Qadr): Better than 1,000 Months (ie. 83 years and 4 months)

إِنَّاۤ أَنزَلۡنَـٰهُ فِی لَیۡلَةِ ٱلۡقَدۡرِ (1) وَمَاۤ أَدۡرَىٰكَ مَا لَیۡلَةُ ٱلۡقَدۡرِ (2) لَیۡلَةُ ٱلۡقَدۡرِ خَیۡرࣱ مِّنۡ أَلۡفِ شَهۡرࣲ (3) تَنَزَّلُ ٱلۡمَلَـٰۤىِٕكَةُ وَٱلرُّوحُ فِیهَا بِإِذۡنِ رَبِّهِم مِّن كُلِّ أَمۡرࣲ (4) سَلَـٰمٌ هِیَ حَتَّىٰ مَطۡلَعِ ٱلۡفَجۡرِ (5) 

“Verily, We have sent it (this Al-Quran) down in the night of al-Qadr (Decree). And what will make you know what the Night of Al-Qadr (Decree) is? The Night of Al-Qadr (Decree) is *better than 1,000 months* (i.e. worshipping Allah in that night is better than worshipping Him a thousand months, i.e. 83 years and 4 months). Therein descend the angels and the Ruh (Jibrail (Gabriel)) by Allah’s permission with all decrees. (All that night), there is peace (and goodness from Allah to His believing slaves) until the appearance of dawn”

[QS Al-Qadr verse 1-5 (97:1-5)] 

2) Tighten Ones' Belt and Enliven the Night

وَعَنْ عَائِشَةَ رَضِيَ اَللَّهُ عَنْهَا قَالَتْ: { كَانَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-إِذَا دَخَلَ اَلْعَشْرُ ‏-أَيْ: اَلْعَشْرُ اَلْأَخِيرُ مِنْ رَمَضَانَ‏- شَدَّ مِئْزَرَهُ, وَأَحْيَا لَيْلَهُ, وَأَيْقَظَ أَهْلَهُ } مُتَّفَقٌ عَلَيْهِ 1‏ .‏

‏1 ‏- صحيح.‏ رواه البخاري ( 2024 )‏، ومسلم ( 1174 )‏، وزاد مسلم: " وجد ".‏ قلت: أي: في العبادة.‏ وقوله: " أي: العشر الأخيرة من رمضان ".‏ فهي من قول الحافظ رحمه الله.‏

'A’isha (RAA) narrated, ‘With the start of the last ten days of Ramadan, the Messenger of Allah (ﷺ) used to *tighten his waist belt (i.e. keep away from his wives) and used to stay up praying all night, and he would also wake his wives (to pray and recite Qur’an etc..)*.” Muttafaqun 'alaihi

Bulugh al-Maram Book 5, Hadith 49

https://sunnah.com/bulugh/5/49 

Sources:

https://sunnah.com/bukhari:2024

https://sunnah.com/muslim:1174