John Gill Commentary Psalms 40:1

"I waited patiently for Jehovah; And he inclined unto me, and heard my cry." — Psalms 40:1 (ASV)

I waited patiently for the Lord
Or "waiting I waited" {i}; which denotes continuance, constancy, and patience; and which Christ exercised in the garden, when he submitted himself entirely to the will of God; and on the cross, when he continued in sure hope and firm expectation of his help and assistance, though he was for a while forsaken by him; see (Isaiah 50:7–9) ;

and he inclined unto me, and heard my cry ;
both in the garden, by delivering him from fear of death; and on the cross, by upholding, helping, and assisting him, by carrying him through his sufferings and death, and raising him from the dead; see (Isaiah 49:8) (Hebrews 5:7) .

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FOOTNOTES:

1. 
   F9 (ytywq hwq) "expectando expectavi", Pagninus, Montanus, Vatablus Musculus, Rivetus, Gejerus, Michaelis; so Ainsworth.