and cause: Maimonides informs us, that it was a capital offence for any one to ride on the king's mule, to sit on his throne, or to handle his sceptre, without permission; and as David ordered Solomon to ride on his own mule, etc., it was ample evidence that he had appointed him his successor.
to ride: 1Ki 1:5, 1Ki 1:38, 1Ki 1:44; Gen 41:43; Est 6:6-11
mine own mule: Heb. the mule which belongeth to me, Lev 19:19