Here is a simple prayer you can say before an interview:
Heavenly Father, I come to you today in need of your guidance and support. I ask that you bless me with the wisdom and confidence I need to do well in this interview. Help me to articulate my thoughts clearly and effectively, and let my passion for this matter shine through. I pray that you would open doors for me that no one can close, and that your will be done in my life. Please be with me in this interview and give me peace in my heart and mind. In your holy name I pray, Amen.
You can also modify and make it personal to your faith or preference. The important thing is to ask for guidance, confidence and clarity.
Heavenly Father, I come to you today in need of your guidance and support. I ask that you bless me with the wisdom and confidence I need to do well in this interview. Help me to articulate my thoughts clearly and effectively, and let my passion for this matter shine through. I pray that you would open doors for me that no one can close, and that your will be done in my life. Please be with me in this interview and give me peace in my heart and mind. In your holy name I pray, Amen.