“The Messenger of Allah ﷺ used to fast until we thought he would never stop fasting. And he used to not fast until we thought we would never fast. And he never fasted any complete month apart from Ramadan, from the time he came to Al- Madinah.”
كَانَ رَسُولُ اللَّهِ ﷺ يَصُومُ حَتَّى نَقُولَ لاَ يُفْطِرُ وَيُفْطِرُ حَتَّى نَقُولَ لاَ يَصُومُ وَمَا صَامَ شَهْرًا مُتَتَابِعًا إِلاَّ رَمَضَانَ مُنْذُ قَدِمَ الْمَدِينَةَ