Commentary for Psalms 86:17

Grant me a sign for good so it may be apparent to others that You have forgiven me.

and let my enemies see the sign and be ashamed. But the Holy One, blessed be He, did not listen to him to grant the sign during his lifetime. Instead, [it came] in his son Solomon’s lifetime when the gates clung to each other and did not open until he said (II Chron. 6:42): “Do not turn back the face of Your anointed; remember the kind deeds of David Your servant.”