Pray, too, that we will be saved from wicked and evil people, for not everyone believes in the Lord. — 2 Thessalonians 3:2 (NLT)
In some countries, open doors may expose missionaries to the possibility of danger and personal harm. Opposition to the gospel may include hatred and violence.

Pray that God will keep Christian workers safe from those who seek to hurt them.
Pray that God will change the hearts of those who are resistant to his Word.