Re:Learn to read Middle English
by tankenmate on Tuesday June 09, 2020 @02:22PM
(#23469200)
the first "tribute" is a gerund (i.e. a verb taking the place of a noun) although i'm not sure of the gerund declension in middle english. the second "tribute" is an imperative verb (with an implied subject and object).
"to him that ye schuleth tribute, tribute" becoming "to him that you should tribute, tribute."
It is a bit odd to modern ears but the second tribute is clearly a shortened exhortation for emphasis. Should in English often implies an obligation and owe falls out from that. "You should apologise for that" -> "You own an apology for that".