The Apostle Paul
Ephesians 4:27BSB·traditional attribution

and do not give the devil a foothold.

John Calvin Reformed @genevareformer

27. Neither give place (τῷ διαβόλῳ) to the devil. I am aware of the interpretation which some give of this passage. Erasmus, who translates it, “neither give place to the Slanderer,” (calumniatori,) shews plainly that he understood it as referring to malicious men.

Matthew Henry Presbyterian @wholebiblehenry

The apostle having gone through his exhortation to mutual love, unity, and concord, in the foregoing verses, there follows in these an exhortation to Christian purity and holiness of heart and life, and that both more general (Eph 4:17-24) and in several particular instances, Eph 4:25-32.

Commenting on Ephesians 4:17-32

John Gill Reformed Baptist @doctorgill

And grieve not the Holy Spirit of God,.... Not a believer's own spirit, sanctified by the Holy Ghost, which is grieved by sin; nor the spirit of a good man, that hears our words and sees our actions, and is displeased and troubled at them; but the third person in the Trinity: and this is said of him by an anthropopathy, and supposes something done...