'Summoned' in the Bible

Paul, called as an apostle (special messenger, personally chosen representative) of Jesus Christ by the will of God, and our brother Sosthenes,

Only, let each one live the life which the Lord has assigned him, and to which God has called him [for each person is unique and is accountable for his choices and conduct, let him walk in this way]. This is the rule I make in all the churches.

For he who was a slave when he was called in the Lord is a freedman of the Lord, likewise he who was free when he was called is a slave of Christ.