'Fervent' in the Bible

He was instructed in the way of the Lord, and being fervent in his spirit, he spoke and taught exactly the things concerning Jesus, knowing only the baptism of John.

as to diligent zealousness, not slothful; in spirit fervent; serving the Lord.

Confess therefore your offences to one another, and pray for one another, that ye may be healed. The fervent supplication of the righteous man has much power.

but before all things having fervent love among yourselves, because love covers a multitude of sins;