Grasping the horns of the altar

1 Kings 2:28-29 (NIV) says: > 28 When the news reached Joab, who had conspired with Adonijah though not with Absalom, he fled to the tent of the LORD and took hold of the horns of the altar. 29 King Solomon was told that Joab had fled to the tent of the LORD and was beside the altar. Then Solomon ordered Benaiah son of Jehoiada, “Go, strike him down!” How did Joab know he could do this? Is there a place in the Old Testament where it says a person could flee to the Temple, grab hold of the horns on the alter, and find safety?