Hadithcore
Sahih Muslim, 1157 b
sahih

This hadith has been narrated on the authority of Abu Bishr with the same chain of transmitters (with a slight variation of words and these are), that he (the narrator) said:

" During any month continuously since he came to Medina."

وَحَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ وَأَبُو بَكْرِ بْنُ نَافِعٍ عَنْ غُنْدَرٍ عَنْ شُعْبَةَ عَنْ أَبِي بِشْرٍ بِهَذَا الْإِسْنَادِ وَقَالَ شَهْرًا مُتَتَابِعًا مُنْذُ قَدِمَ الْمَدِينَةَ

References2 variants
In-Book Reference
Book 13, Hadith 231
USC-MSA web (English) reference
Book 6, Hadith 2584 (deprecated numbering scheme)