Following the appointment of guards upon the walls of Jerusalem [שד״ל], a vision of absolute comfort and future security emerges. God issues an unconditional decree, ensuring that the people of Israel will finally enjoy the fruits of their labor in peace, completely free from the control of hostile forces [רד״ק, אבן עזרא].
To seal this guarantee, God takes an oath, raising His hand in a traditional gesture of a sworn pledge [ביאור שטיינזלץ]. The vow is framed as a strong, unbreakable promise, assuring that the plundering of their land will simply never happen again [מצודת דוד]. He swears by His power and might. The primary approach among commentators is that this dual expression of strength highlights God's eternal power and His absolute ability to stop anyone from taking the harvest by force [רד״ק, אבן עזרא, מצודת ציון, צאינה וראינה]. However, another perspective suggests a deeper distinction between the two forms of strength mentioned. One represents miraculous guidance granted as a reward for the good deeds of the Israelites, while the other signifies a salvation God will bring about entirely through His own power, even if the people lack sufficient merit [מלבי״ם].
The vow guarantees protection over two distinct types of crops and two types of threats. First, it promises that nearby enemies, who live just across the borders, will no longer invade to steal the grain [מלבי״ם]. Second, it assures that distant foreigners will never again take the new wine produced from the vineyards [מצודת ציון, ביאור שטיינזלץ], a valuable good typically transported over long distances for trade [מלבי״ם]. This protection specifically covers the yields that require immense physical effort—the grain and wine that demand plowing, harvesting, and gathering into the home and the winepress [מצודת דוד, ביאור שטיינזלץ].
An additional layer of meaning connects this future security to the commandment of tithes. Historically, when the Israelites failed to separate their tithes properly, the resulting punishment came in the form of famine and foreign invaders seizing their crops. Yet, in the future, the world's reality will completely transform. Poverty will vanish, removing the need for the poor tithe, and the Levites will inherit their own land, eliminating the need for the first tithe. The only remaining obligation will be the second tithe, which the owners themselves will eat in a state of holiness in Jerusalem. Because the people will no longer stumble in the sin of neglecting their tithes, God can swear with certainty that enemies will never again consume their harvest, allowing the Israelites to rightfully enjoy the rewards of their labor [אהבת יהונתן].