1-е Петра 1:15

Literally, "But (rather) after the pattern of Him who hath called you (whose characteristic is that He is) holy, be (Greek, 'become') ye yourselves also holy." God is our grand model. God's calling is a frequently urged motive in Peter's Epistles. Every one that begets, begets an offspring resembling himself [EPIPHANIUS]. "Let the acts of the offspring indicate similarity to the Father" [AUGUSTINE]. conversation--deportment, course of life: one's way of going about, as distinguished from one's internal nature, to which it must outwardly correspond. Christians are already holy unto God by consecration; they must be so also in their outward walk and behavior in all respects. The outward must correspond to the inward man.

The apostle describes the persons to whom he writes, and salutes them (Pe1 1:1, Pe1 1:2), blesses God for their regeneration to a lively hope of eternal salvation (Pe1 1:3-5), in the hope of this salvation he shows they had great cause of rejoicing, though for a little while they were in heaviness and affliction, for the trial of their faith, which would produce joy unspeakable and full of glory (Pe1 1:6-9). This is that salvation which the ancient prophets foretold and the angels desire to look into (Pe1 1:10-12). He exhorts them to sobriety and holiness, which he presses from the consideration of the blood of Jesus, the invaluable price of man's redemption (Pe1 1:13-21), and to brotherly love, from the consideration of their regeneration, and the excellency of their spiritual state (Pe1 1:22-25).

1:15-16 “You must be holy because I am holy”: This is a common refrain in Scripture, that God’s people must be holy as God is holy (see Lev 11:44-45; 19:2; 20:7; see also Ezek 20:12; Eph 1:4; 1 Thes 4:3; Rev 22:11).