“God blessed the seventh day and sanctified it” Genesis 2:3.
Not only was time sanctified, but the firstborn of Israel (both man and beast: Numbers 8:17), the tabernacle (Exodus 29:43), the people of Israel (Exodus 19:14), Aaron, his sons and their garments (Leviticus 8:30), Jesse and his sons (1Samuel 16:5), Jeremiah in the womb (Jeremiah 1:5), the Son of God before he was sent into the world (John 10:36), his disciples (John 17:17), the Gentiles (Acts 28:18), some at Corinth (1Corinthians 1:2), unbelieving husbands and wives (1Corinthians 7:4), every creature of God (1Thessalonians 4:4,5), even God Himself (Leviticus 10:3) was sanctified.
It would appear that there is no limit to who or what can be sanctified. But how are they sanctified?
The seventh day was sanctified “because that in it He [God] had rested” (Genesis 2:3). His sabbaths are “a sign” that the LORD “doth sanctify you" (Exodus 31:13; Ezekiel 20:12). A fast was sanctified when the people would “call a solemn assembly, gather the elders” and “cry unto the LORD” (Joel 1:14) and “blow the trumpet in Zion” (Joel 2:15). The tabernacle, Aaron and his sons, were sanctified with “the anointing oil” (Leviticus 8:10) and “the blood which was upon the altar” (verse 30). The people of Israel were sanctified and “they washed their clothes” (Exodus 19:10,14). The priests and Levites “sanctified themselves” (1Chronicles 15:14). Then they sanctified the house of the LORD “to cleanse it, and brought out all the uncleanness” (2Chronicles 29:16). Washing and cleansing is certainly an important part of being sanctified. “You are washed, but you are sanctified, but you are justified...by the Spirit of our God” (1Corinthians 6:11). Jesus “might sanctify and cleanse it [the church] with the washing of water by the word" (Ephesians 5:26). The cleansing is both external and internal. The priests “sanctified themselves in holiness” (2Chronicles 31:18). “Sanctify yourselves therefore, and be holy” (Leviticus 20:7). “God that is holy shall be sanctified in righteousness” (Isaiah 5:16). The sons of Zadok were sanctified by keeping God’s charge and not going astray (Ezekiel 48:11).
Jesus, the Truth, sanctified himself for our sake, that we might be sanctified through the Truth (John 17:17,19). We are sanctified by faith that is in Him (Acts 26:18) “through sanctification of the Spirit and belief of the Truth” (2Thessalonians 2:13). God made Jesus “unto us wisdom, and righteousness, and sanctification” (1Corinthians 1:30). Thus, we are “sanctified in Christ Jesus” (1Corinthians 1:2) because we “are sanctified through the offering of the body of Jesus Christ” (Hebrews 10:10) and by “the blood of the covenant” (verse 29). He could “sanctify the people with his own blood” (Hebrews 13:12). And because God sent His Son, we “are sanctified by God the Father” (Jude 1).
We are to “sanctify the LORD of hosts himself” (Isaiah 8:13). How? “let Him be your fear.” “Sanctify the Lord God in your hearts” (1Peter 3:15).
Grace and peace be unto you from God the Father and from the Lord Jesus Christ the Son of the Father in truth and love. 2 John 3