Ignatius was a disciple of Polycarp, who was a disciple of John himself; thus, since Ignatius explicitly identifies “the Lord’s Day” as that day “on which our life as well as theirs shone forth,” John’s more ambiguous reference appears more certain to describe the first day of the week as a special, dedicated sacred day.

An early second-century letter from Ignatius, one of the first pastors of the church in Antioch, helps to solidify that the first day of the week became for Christians their primary day of worship and that they referred to it as “the Lord’s Day.”

The phrase “Lord’s Day” appears only once in the New Testament in Revelation 1:10, where the particular day John is referencing is unclear.

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