'Man of God' in the Bible

The heads of the Levites were Hashabiah, Sherebiah and Jeshua the son of Kadmiel, with their brothers opposite them, to praise and give thanks, as prescribed by David the man of God, division corresponding to division.

and his kinsmen, Shemaiah, Azarel, Milalai, Gilalai, Maai, Nethanel, Judah and Hanani, with the musical instruments of David the man of God. And Ezra the scribe went before them.