wiþinnan [OE]
within [MI]
ɯiþin
https://www.etymonline.com/word/within#etymonline_v_25517
https://www.merriam-webster.com/dictionary/within#dictionary-entry-2
https://quod.lib.umich.edu/m/middle-english-dictionary/dictionary/MED53079
https://bosworthtoller.com/36242