I will not abandon you, nor will I leave you

RESUMEN: David's words may not have explicitly promised help, but they were endorsed by the Lord and therefore true. We should remember the Lord's past mercies and have confidence that He will deliver us again. We should not fear the enemy, as God has been with us before and will be with us again. Let us have courage.

This is not a promise if we only consider the words, but it is truly a promise in terms of their meaning; for David spoke a word that the Lord endorsed making it true. He argued, based on past releases, that he would receive help in some new danger. In Jesus, all the promises are Yes and Amen for the glory of God through us, and thus the previous dealings of the Lord with His believing people will be repeated.

Let us then proceed to recall the previous mercies of the Lord. We could not have previously expected to be delivered by our own strength; but the Lord delivered us. Won't it save us again? We are confident that it will. Just as David ran to meet the enemy, so will we. The Lord has been with us, is with us, and has said: "I will not forsake you, nor will I leave you." Why do we shudder? Was the past a dream? Think of the bear and the lion, already dead. Who is this Philistine? It is true that he is not the same Philistine, and neither is he a bear or a lion; but God is the same, and His honor is as involved in one case as in the other. He did not save us from the beasts of the forest to allow a giant to kill us. Let's have a lot of courage.

Source: The Bank of Faith Checkbook. Translation by Allan Roman.

http://www.spurgeon.com.mx/chequera/meditames/febrero.pdf