There is no scriptural support to fear Satan.
Nowhere in the Bible does it say you are to fear Satan.
You are instead to fear the Lord.
“The secret of the Lord is with those who fear Him, And He will show them His covenant.”
- Psalm 25:14
“The end of the matter; all has been heard.
Fear the Lord and keep his commandments, for this is the whole duty of man.
For the Lord will bring every deed into judgment, with every secret thing, whether good or evil.”
- Ecclesiastes 12:13–14
To fear Satan is to allow Satanic influences to harm your soul, and not let the Holy Spirit protect your soul from harm.
The enemy can influence our thoughts and actions by invoking fear.
"For God has not given us a spirit of fear, but of power and love and a sound mind.”
- 2 Timothy 1:7
“Do not be afraid of those people who can kill only your body.
These people cannot kill your soul.
No, it is the Lord that you should be afraid of.
He can kill your body, and then he can also destroy your soul in hell.”
- Matthew 10:28
Ephesians: Faith in the Lord is a shield against Satan's influence.
“10 Finally, be strong in the Lord and in his mighty power.
11 Put on the full armor of God, so that you can take your stand against the devil’s schemes.
12 For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms.
13 Therefore put on the full armor of God, so that when the day of evil comes, you may be able to stand your ground, and after you have done everything, to stand.
14 Stand firm then, with the belt of truth buckled around your waist, with the breastplate of righteousness in place,
15 and with your feet fitted with the readiness that comes from the gospel of peace.
16 In addition to all this, take up the shield of faith, with which you can extinguish all the flaming arrows of the evil one.”
- Ephesians 6:10-16