Paul told the Corinthian believers

• to hand the incestuous person over to Satan for the destruction of the flesh (1 Cor. 5:5)
• that husbands and wives should not deprive one another sexually lest Satan tempt them because of their lack of self-control (1 Cor. 7:7)
• that they should reinstate the presumably repentant offender so that Satan might not outwit us (2 Cor. 2:11)
• that Satan masquerades as angel of light (2 Cor. 11:14)
• and that the apostle himself was given a thorn in the flesh, a messenger of Satan, to torment him so as to prevent him from becoming conceited (2 Cor. 12:7).

He informed the Thessalonian believers

• that Satan prevented him from revisiting them (1 Thess. 2:18)
• and that ‘the coming of the lawless one will be in accordance with how Satan works. He will use all sorts of displays of power through signs and wonders that serve the lie, and all the ways that wickedness deceives those who are perishing’ (2 Thess. 2:9–10).

He informed his colleague, Timothy,

• that he had handed over Hymenaeus and Alexander to Satan to be taught not to blaspheme (1 Tim. 1:20)
• and that some others had ‘already turned away to follow Satan’ (1 Tim. 5:15).

In addition to these references to ‘Satan’, we find in Paul’s letters several references to the devil, referring of course to the same adversary of God’s people. In Ephesians believers are

• warned about giving the devil a foothold (Eph 4:27)
• and urged to put on the full armor of God so that they can stand against the devil’s schemes (Eph 6:11).

He informs Timothy

• that an overseer in the church must ‘have a good reputation with outsiders, so that he will not fall into disgrace and into the devil’s trap’ (1 Tim. 3:7),
• and that the Lord’s servant must be able to gently instruct those who oppose him in the hope that God will grant them repentance so that they come to their senses and escape the trap of the devil (2 Tim. 2:24–26).

In Romans 16:20 Paul’s point is

• that, despite his awareness of Satan’s activity in all sorts of ways to wreak havoc among God’s people, God will most certainly crush him under their feet.

Kruse, The Pillar Commentary on Paul’s Letter to the Romans (formatting added)