WELS receives Mark 16:9-20 (the longer ending) as part of the biblical canon and canonical Scripture. While WELS may be aware of textual-critical discussions, the movement's operational canon includes Mark 16:9-20 as authoritative Scripture. WELS uses the longer ending in its Bibles, catechesis, and liturgy. The passage's content — the resurrection, the apostolic commission, signs and wonders — is received as biblical instruction.

WELS strict confessional subscription includes the reception of the biblical books 'as the church has received them.' Mark 16:9-20 is part of the received textual tradition of the Gospel of Mark in the church's canon. WELS teaching treats the passage as authoritative Scripture.