Adam Clarke on Ephesians 4:27

Neither give place to the devil - Your adversary will strive to influence your mind, and irritate your spirit; watch and pray that he may not get any place in you, or ascendancy over you.

As the word διαβολος is sometimes used to signify a calumniator, tale-bearer, whisperer, or backbiter; (see in the original, 1Tim 3:11; 2Tim 3:3, and Tit 2:3); here it may have the same signification. Do not open your ear to the tale-bearer, to the slanderer, who comes to you with accusations against your brethren, or with surmisings and evil speakings. These are human devils; they may be the means of making you angry, even without any solid pretense; therefore give them no place, that you may not be angry at any time; but if, unhappily, you should be overtaken in this fault, let not the sun go down upon your wrath; go to your brother, against whom you have found your spirit irritated; tell him what you have heard, and what you fear; let your ears be open to receive his own account; carefully listen to his own explanation; and, if possible, let the matter be finally settled, that Satan may not gain advantage over either.