Isaiah 38:7 uses the identical formula 'this shall be a sign unto thee from the LORD' for Hezekiah's healing—direct verbal and contextual parallel.

Isaiah 7:21-25 uses the same image of eating from untilled land, but as a sign of judgment, contrasting with the sign of deliverance here.

Isaiah 7:14 is another 'sign' given by God through Isaiah, though to Ahaz and with messianic fulfillment—shared motif of prophetic signs.

Leviticus 25:20-22 promises a triple yield in the sixth year to cover the sabbath year and the eighth, mirroring the two years of volunteer food followed by normal sowing.

2 Kings 19:29 records the identical sign—eating volunteer growth for two years then normal farming—confirming the divine promise to Hezekiah.

Exodus 3:12 gives Moses a sign (token) of future deliverance, similar to Hezekiah's sign—both confirm God's promise through a future event.

Leviticus 25:4 commands letting the land rest so the poor eat what grows of itself—similar to the two years of volunteer produce in this sign.

Leviticus 25:5 continues the sabbath year law, forbidding reaping aftergrowth—matching the idea of eating what springs naturally without sowing.

Leviticus 25:22 specifies eating from the old crop until the ninth year's harvest—a similar timeline of relying on previous produce as in the sign.