Jerome of Stridon
Thus declares the Sovereign Lord: On the day I selected the house of Israel and raised my hand for the tribe of Jacob, I revealed myself to them in the land of Egypt. I proclaimed to them, saying, "I am the Lord your God." On that day, I raised my hand to deliver them from Egypt and lead them to a land I had designated for them, a land abundant in milk and honey, the finest of all lands. Since that time, when I chose Israel and made myself known to the descendants of Jacob in Egypt, I welcomed them, affirming, "I am the Lord your God." On that day, I grasped them by my hand, promising to bring them out of Egypt into a land prepared for them, flowing with milk and honey, a land more delightful than any other.
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When compared to other regions, this land is deemed more glorious and fruitful, which can be seen from its vastness stretching from Rinokurura to Mount Taurus and the Euphrates River. It encompasses mighty cities and scenic territories such as Palestine, Phoenicia, Arabia, Kelesiria, Cilicia, and other regions promised to Israel, contingent on their obedience to God's commandments. Should they fail to inherit this promise, it would be a result of their disbelief. Even within Palestine and the Jewish territories, numerous nations remained that had not been expelled.
The giver of a promise bears responsibility; if the recipient becomes unworthy, the fault lies not with the one who made the promise. The Lord offers a choice: if you are willing and obey me, you will experience the blessings of the earth; but if you refuse, destruction will ensue. As stated in Isaiah 1:19-20, those chosen in this age are not spared from temptation and potential downfall. Both Saul, anointed as king, and Judas, one of the apostles, ultimately fell because of their own failings.
The act of raising or extending the hand signifies the position of the one afflicted—indicating that He will strike down the Egyptians and free Israel from their bondage in Egypt.