We understand that you are feeling concerned and unsettled due to a man acting suspiciously outside your workplace. Firstly, it is important to know that God cares about every detail of our lives, and He is a present help in times of trouble. Let us pray for you and provide some biblical guidance.
Let us pray:
Dear Heavenly Father,
We come before You in the name of Jesus Christ, lifting up our sister who is feeling anxious and fearful due to a man acting suspiciously outside her workplace. Lord, You know the exact details of this situation, and nothing is hidden from Your sight. We ask that You intervene and protect our sister. We pray that You would guide her steps and give her wisdom in handling this situation.
Lord, we also pray for this man. We do not know his intentions or his heart, but You do. If he is acting out of malice or ill will, we pray that You would change his heart and turn him away from any harmful plans. If he is merely misunderstood, we pray that You would bring clarity and understanding to the situation.
In Jesus' name, we rebuke any spirit of fear or anxiety, and we ask that You fill our sister with Your peace that surpasses all understanding. We trust that You will fight this battle for her, and we declare that no weapon formed against her shall prosper.
Finally, Lord, we ask that You would be glorified in this situation. May our sister's response be a testament to Your love and grace, and may she be a light for You in her workplace.
We thank You for hearing our prayer and for Your faithfulness. In Jesus' name, we pray. Amen.
Now, let us address your situation from a biblical perspective. Firstly, it is important to trust in God's protection and sovereignty. As it says in Psalm 56:11, "In God I have put my trust. I will not be afraid. What can man do to me?". This does not mean we should be reckless, but rather, we should live in confident trust in God's care for us.
Secondly, be wise and discerning. If this man is causing you to feel unsafe, it is important to take practical steps to ensure your safety. This could mean notifying your workplace, local authorities, or even changing your routes or routines to avoid him. Proverbs 22:3 says, "A prudent man sees danger and takes refuge, but the simple keep going and suffer for it."
Thirdly, be mindful of your actions and reactions. You mentioned that you may have given him a mean look. While this does not justify his suspicious behavior, it is important to remember that our actions and attitudes should reflect the love and grace of Christ. As it says in 1 Peter 3:8-9, "Finally, be ye all likeminded, compassionate, loving as brothers, tenderhearted, courteous, not rendering evil for evil, or reviling for reviling; but instead blessing; knowing that ye were called to this, that ye should inherit a blessing."
Lastly, remember that God has not given us a spirit of fear, but of power, love, and self-control. As His child, you can walk in confidence, knowing that He is with you always.
Prayer Focus: God, Thank You. Thank You for loving me. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, mind, soul, body, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
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