The Lord will remember the covenants he has made with his people. Verse 26 says that he will lift up an ensign. He will hiss or whistle to them to call them back. The Lord is not angrily hissing—he is reaching out in love to his children and fulfilling his promises. The ensign will be erected; it will be a gathering point and a rallying post that will bring people back together so that, in the end, the Lord will be victorious.
Book of Mormon Central, "Why Do Early Nephite Prophets Speak about the Scattering of the Jews? (2 Nephi 15:13)," KnoWhy 42 (February 26, 2016).