King James Version (KJV)
And this {shall be} a sign unto thee from the LORD, that the LORD will do this thing that he hath spoken;
Modern English
This shall be the sign to you from Yahweh, that Yahweh will do this thing that he has spoken.
Hebrew
וְזֶה־לְּךָ֥ הָא֖וֹת מֵאֵ֣ת יְהוָ֑ה אֲשֶׁר֙ יַעֲשֶׂ֣ה יְהוָ֔ה אֶת־הַדָּבָ֥ר הַזֶּ֖ה אֲשֶׁ֥ר דִּבֵּֽר׃
vzeh-lka haʾvot meʾet yhvah ʾasher yaʿasheh yhvah ʾet-hadabar hazeh ʾasher diber