1 Timothy 5:18 quotes Luke 10:7 alongside Deuteronomy 25:4 and calls both 'Scripture'

1 Timothy 5:18 reads: 'For the Scripture says, "You shall not muzzle an ox when it treads out the grain," and, "The laborer deserves his wages."' The first quote is from Deuteronomy 25:4. The second quote — 'the laborer deserves his wages' — is from Luke 10:7, not the Old Testament. Mike argues this means the author is calling Luke's Gospel (or the Jesus tradition behind it) 'Scripture,' making this an early first-century example of New Testament self-canonization. He raises the question: does this mean the author knew Luke's Gospel directly, or that both authors knew the same Jesus-tradition independently? Either way, Paul is carrying Jesus's authoritative teaching forward.