BT Er 62a(33) :מוהרקי ואבורגאני‏ : valid documents [i.e. bearing seals of officials and not of private individuals]
See the entire entry for wˀbrygn adj. trustworthy, valid

BT Er 62a(33) :בריאה במוהרקי ואבורגאני, רעועה בלא מוהרקי ואבורגאני‏ : a healthy (rental transaction) is with reliable documents, a shaky one is without reliable documents
See the entire entry for wbwrgn adj. reliable

BT Er 62a(33) :מוהרקי ואבורגאני‏ : valid documents
See the entire entry for mwhrq n.m. document, writ