[Machine] To stay in seclusion in the mosque and observe fasting, the Messenger of Allah ﷺ was asked by someone who had converted to Islam. He commanded him to fulfill his vow, mentioning the vow of fasting along with seclusion. This strange incident was narrated exclusively by Sa'id bin Bashir, on the authority of 'Ubaidullah. And Allah knows best.
أَنْ يَعْتَكِفَ فِي الشِّرْكِ وَلَيَصُومَنَّ فَسَأَلَ رَسُولَ اللهِ ﷺ بَعْدَ إِسْلَامِهِ فَأَمَرَهُ أَنْ يَفِيَ بِنَذْرِهِ ذِكْرُ نَذْرِ الصَّوْمِ مَعَ الِاعْتِكَافِ غَرِيبٌ تَفَرَّدَ بِهِ سَعِيدُ بْنُ بَشِيرٍ عَنْ عُبَيْدِ اللهِ وَاللهُ أَعْلَمُ