'Faithfully' in the Bible

And he charged them, saying, Thus shall ye do in the fear of Jehovah, faithfully, and with a perfect heart.

And they brought in the oblations and the tithes and the dedicated things faithfully: and over them Conaniah the Levite was ruler, and Shimei his brother was second.

And the men did the work faithfully: and the overseers of them were Jahath and Obadiah, the Levites, of the sons of Merari; and Zechariah and Meshullam, of the sons of the Kohathites, to set it forward; and others of the Levites, all that were skilful with instruments of music.