The Messiah would provide salvation for all mankind.
OT Prophecy NT Fulfillment
Joel 2:32
And it shall come to pass, that whosoever shall call on the name of the LORD shall be delivered: for in mount Zion and in Jerusalem shall be deliverance, as the LORD hath said, and in the remnant whom the LORD shall call.
Romans 10:12–13
[12] For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him.
[13] For whosoever shall call upon the name of the Lord shall be saved.
Tanakh – Neviim – Joel 3:5
And it shall come to pass, that whosoever shall call on the name of HaShem shall be delivered; for in mount Zion and in Jerusalem there shall be those that escape, as HaShem hath said, and among the remnant those whom HaShem shall call.
Hebrew OT – Joel 3:5
[3:5] וְהָיָה כָּל־אֲשֶׁר יִקְרָא בְּשֵׁם יְהוָה יִמָּלֵט
כִּי בְּהַר־צִיּוֹן וּבִירוּשָׁלִַם תִּהְיֶה פְּלֵיטָה
כַּאֲשֶׁר אָמַר יְהוָה
וּבַשְּׂרִידִים אֲשֶׁר יְהוָה קֹרֵא