“The Prophet’s ﷺ devotion increased in Sh’aban, then again at the beginning of the new month, culminating in the last ten days of Ramadan.” – Shaykh Riyadh ul Haq
“Aishah (ra) said, ‘When the last ten days would begin the Prophet ﷺ would fasten his cloth, keep vigil, and awaken his family.’ (al-Bukhari)” – Shaykh Riyadh ul Haq