1 Corinthians 7:14
"For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband: else were your children unclean; but now are they holy."
Cross References (ranked by relevance)
Titus 1:15
Unto the pure all things are pure: but unto them that are defiled and unbelieving is nothing pure; but even their mind and conscience is defiled.
Isaiah 52:1
Awake, awake; put on thy strength, O Zion; put on thy beautiful garments, O Jerusalem, the holy city: for henceforth there shall no more come into thee the uncircumcised and the unclean.
1 Timothy 4:5
For it is sanctified by the word of God and prayer.
Romans 11:16
For if the firstfruit be holy, the lump is also holy: and if the root be holy, so are the branches.