Is it Sunnah to read سُبْحَانَ الْمَلِكِ الْقُدُّوْسِ three times after Witr Ṣalāh throughout the year or only in Ramaḍān?
بسم الله الرحمن الرحيمAnswer
It is Sunnah to read سُبْحَانَ الْمَلِكِ الْقُدُّوْسِ three times after Witr Ṣalāh throughout the year. This was the general habit of the Prophet ﷺ who would raise and prolong his voice the third time as reported in several authentic narrations.
Allah knows best
27 Jumādā al-Thāniyah 1437 / 5 April 2016
Approved by: Mufti Shabbir Ahmad Sahib
 Tabyīn al-Ḥaqāʾiq (1: 170); al-Mugnī (2: 122); Zād al-Maʿād (1: 326); al-Majmūʿ (4: 16); Sharḥ al-Zurqānī ʿAlā al-Mawāhib (11: 13).
 Muṣannaf Ibn Abī Shaybah (6873); Musnad Aḥmad (15354, 15355); Sunan Abū Dāwūd (1430); Sunan al-Nasāʾī (1699); al-Mustadrak (1009).