The only reason that Hazrat Moulana Husain Ahmad Madani (rahmatullahi ‘alaih) had given himself up for imprisonment in Malta was to serve his ustaaz, Shaikhul Hind Moulana Mahmoodul Hasan (rahmatullahi ‘alaih). Hazrat Moulana Madani (rahmatullahi ‘alaih) rendered such service that Shaikhul Hind (rahmatullahi ‘alaih) once mentioned to his wife, “My own son would not have been able to render the service which Molvi Husain Ahmad had made for me.”
Because Malta was extremely cold, and there was no hot water to make wudhu with, Hazrat Moulana Madani (rahmatullahi ‘alaih) would hold the water bag to his stomach the entire night just so that it would be warm enough for his ustaaz to use at the time of Tahajjud.
(Hazrat Moulana Husain Ahmad Madani [rahmatullahi ‘alaih] pg. 219)