of Judgement we should observe fasts in hot weather. Due to the thought of the Hereafter, our pious saints رَحِمَهُمُ الـلّٰـهُ تَـعَالٰی used to observe fast abundantly as some of them used to spend many years observing fasts continuously.

Would always observe fast

Sayyiduna ‘Usman-e-Ghani رَضِىَ اللهُ تَعَالٰی عَـنْهُ would always observe Nafl fasts. Having taken rest during the initial part of the night, he رَضِىَ اللهُ تَعَالٰی عَـنْهُ would spend the rest of the night for Qiyam (worship).

(Musannaf Ibn Abi Shaybah, vol. 2, pp. 173, Raqm 6)

Due to excess of fasts he turned yellow

Sayyiduna Aswad Bin Yazeed رَحْمَةُ اللهِ تَعَالٰی عَلَيْه would make lots of effort in worships and spiritual exercises. He رَحْمَةُ اللهِ تَعَالٰی عَلَيْه would worship so much and would   fast abundantly that he رَحْمَةُ اللهِ تَعَالٰی عَلَيْه even turned light green and yellow in complexion. (‘Uyoon-ul-Hikayaat, part 1, pp. 51)

Observed fasts continuously for forty years

Sayyiduna Dawood Taa`ee رَحْمَةُ اللهِ تَعَالٰی عَلَيْه observed fasts continuously for forty years. He رَحْمَةُ اللهِ تَعَالٰی عَلَيْه was so sincere in his worship that he رَحْمَةُ اللهِ تَعَالٰی عَلَيْه would not even let his family know about his fasts. While going to work he رَحْمَةُ اللهِ تَعَالٰی عَلَيْه would take lunch with him and give it to someone on his way. After Maghrib, he رَحْمَةُ اللهِ تَعَالٰی عَلَيْه would return home and eat food. (Ma’dan-e-Akhlaq, part 1, pp. 182)

Fasted throughout the day and worship throughout the night for 60 years

Sayyiduna Mansoor Bin Mu’tamir رَحْمَةُ اللهِ تَعَالٰی عَلَيْه spent 60 years worshipping at night and fasting in the day. (152 Rahmat Bhari Hikayaat, pp. 78)

Would fast after a gap of one day

Sayyiduna ‘Allamah Shaykh ‘Imaaduddin رَحْمَةُ اللهِ تَعَالٰی عَلَيْه was a great jurist and Mufti. He رَحْمَةُ اللهِ تَعَالٰی عَلَيْه was a great worshipper and a pious person. He رَحْمَةُ اللهِ تَعَالٰی عَلَيْه would observe Nafl fasts and offer Nafl Salah abundantly. He رَحْمَةُ اللهِ تَعَالٰی عَلَيْه would observe a fast after one day gap. (152 Rahmat Bhari Hikayaat, pp. 260)