Commentaries:
Robertson's Word Pictures (NT)
Seeing ye have purified (hgnikotev). Perfect active participle of agnizw, old verb from agnov (pure), here with yuxav (souls), with kardiav (hearts) in James 4:8 as in I John 3:3 of moral cleansing also. See the ceremonial sense of the word as in LXX in John 11:55; Acts 21:24, Acts 21:26; Acts 24:18.
In your obedience (en th upakoh). With repetition of the idea in I Peter 1:2, I Peter 1:14 (children of obedience).
To the truth (thv aleqeiav). Objective genitive with which compare John 17:17, John 17:19 about sanctification in the truth and II Thessalonians 2:12 about believing the truth. There is cleansing power in the truth of God in Christ.
Unfeigned (anupokriton). Late and rare double compound, here alone in Peter, but see James 3:17; II Corinthians 6:6, etc. No other kind of filadelfia (brotherly love) is worth having (I Thessalonians 4:9; Hebrews 13:1; II Peter 1:7).
From the heart fervently (ek kardiav ektenwv). Late adverb (in inscriptions, Polybius, LXX). The adjective ektenhv is more common (I Peter 4:8).
Other Robertson's Word Pictures (NT) entries containing 1 Peter 1:22:
Acts 12:5
Acts 21:24
James 4:8
1 Peter 1:2
1 Peter 2:1
2 Peter 1:7
1 John 3:3
DISCLAIMER: Church of the Great God (CGG) provides these resources to aid the individual in studying the Bible. However, it is up to the individual to "prove all things, and hold fast to that which is good" (I Thessalonians 5:21). The content of these resources does not necessarily reflect the views of CGG. They are provided for information purposes only.