Responsa for Psalms 46:3

עַל־כֵּ֣ן לֹא־נִ֭ירָא בְּהָמִ֣יר אָ֑רֶץ וּבְמ֥וֹט הָ֝רִ֗ים בְּלֵ֣ב יַמִּֽים׃

Therefore will we not fear, though the earth do change, And though the mountains be moved into the heart of the seas;