Ezra 8:18-19

181According to the good hand of our God upon us they brought us a 2man of insight of the sons of Mahli, the son of Levi, the son of Israel, namely Sherebiah, and his sons and brothers, 18 men;

19and Hashabiah and 3Jeshaiah of the sons of Merari, with his brothers and their sons, 20 men;