Adam Clarke on 1 Chronicles 13:14

The Lord blessed the house of Obed-edom - That this man was only a sojourner at Gath, whence he was termed Gittite, and that he was originally a Levite, is evident from 1Chr 15:17, 1Chr 15:18.

The Targum ends this chapter thus: "And the Word of the Lord blessed Obed-edom, and his children, and his grand-children; and his wife conceived, and his eight daughters-in-law: and each brought forth eight at one birth, insomuch that in one day there were found, of fathers and children, fourscore and one; and He blessed and increased greatly all that belonged to him." This exposition will not be generally received; but all rabbins must be allowed to deal in the marvellous.

For other remarks see on 2Sam 6:1 (note), etc.