John Gill Commentary Psalms 31:2

"Bow down thine ear unto me; deliver me speedily: Be thou to me a strong rock, A house of defence to save me." — Psalms 31:2 (ASV)

Bow down your ear to me
Which is said after the manner of men, who, when they give attention, and listen to anything, stoop, and incline the ear; and this for God to do, as he sometimes does, is wonderful condescending grace!

deliver me speedily ;
which shows that he was in great danger, and his case required haste: the Lord does help right early, and is sometimes a present help in time of need, and delivers at once, as soon as the mercy is asked for;

be you my strong rock :
for shelter and security from enemies, as well as to build his everlasting salvation on, and to stand firmly upon, and out of danger;

for an house of defence to save me ;
both for an house to dwell in, Lord being the dwelling place of his people in all generations, and a strong habitation to which they may continually resort; and for protection and safety, their place of defence in him being the munition of rocks, a strong hold, and a strong tower from the enemy.