'Fervent' in the Bible

Fervent lips and a wicked heart Are like an earthen vessel overlaid with silver dross.

This man had been instructed in the way of the Lord; and being fervent in spirit, he spake and taught accurately the things concerning Jesus, knowing only the baptism of John:

in diligence not slothful; fervent in spirit; serving the Lord;

above all things being fervent in your love among yourselves; for love covereth a multitude of sins:

But the day of the Lord will come as a thief; in the which the heavens shall pass away with a great noise, and the elements shall be dissolved with fervent heat, and the earth and the works that are therein shall be burned up.

looking for and earnestly desiring the coming of the day of God, by reason of which the heavens being on fire shall be dissolved, and the elements shall melt with fervent heat?