While the variations for large communities, however, exhibit only a trifling range from recensional epoch to another; those for their several component groups or departments when compared with each other, or each with its correlative issue in different years, become both unsteady and wide […]
Source: wiktionary
The Greek position of "the priests," chaps. xxvii. 16; xxviii. 5; is evidently recensional, as the two passages are so similar and stand so near to each other.
Source: wiktionary
The recensional variation found in some tractates suggests the possibility that at an early stage of the – oral (?) – transmission there was no urtext, or that passages not stemming from the urtext entered into the text at this time.
Source: wiktionary