Zaccur

Mindful. Father of Shammua, who was one of the spies sent out by Moses (Numbers 13:4).

A Merarite Levite (1 Chronicles 24:27).

A son of Asaph, and chief of one of the courses of singers as arranged by David (1 Chronicles 25:2,10).

Son of Imri (Nehemiah 3:2).

A Levite (Nehemiah 10:12).

The son of Mattaniah (Nehemiah 13:13).

Source: Easton's Bible Dictionary
Zaccur

(mindful ). Father of Shammua, the Reubenite spy. (Numbers 13:4) (B.C. 1451.) A Merarite Levite, son of Jaaziah. (1 Chronicles 24:27) Son of Asaph the singer. (1 Chronicles 25:2,10; Nehemiah 12:35) The son of Imri who assisted Nehemiah in rebuilding the city wall. (Nehemiah 3:2) (B.C. 446.) A Levite, or family of Levites, who signed the covenant with Nehemiah. (Nehemiah 10:18) (B.C. 410.) A Levite whose son or descendant Hanan was one of the treasurers over the treasuries appointed by Nehemiah. (Nehemiah 13:13)

Source: Smith's Bible Dictionary