Reference

Isaiah 28:12

To whom he said, This is the rest wherewith ye may cause the weary to rest; and this is the refreshing: yet they would not hear.
10

For precept must be upon precept, precept upon precept; line upon line, line upon line; here a little, and there a little:

11

For with stammering lips and another tongue will he speak to this people.

12

To whom he said, This is the rest wherewith ye may cause the weary to rest; and this is the refreshing: yet they would not hear.

13

But the word of the Lord was unto them precept upon precept, precept upon precept; line upon line, line upon line; here a little, and there a little; that they might go, and fall backward, and be broken, and snared, and taken.

14

Wherefore hear the word of the Lord, ye scornful men, that rule this people which is in Jerusalem.

Counter-Arguments

The strongest case that this verse does not belong in this theme.

Sabbath as Spiritual Rest

The verse does not explicitly mention the Sabbath, nor does it directly link "rest" or "refreshing" to a spiritual rest in Christ. The "rest" and "refreshing" are presented as something offered by "him" (referring to God in the preceding verses), but the nature of this rest is not specified as being the Sabbath or a spiritual rest in Christ within this single verse.