וְעַתָּה֙ הִנֵּ֣ה יָדַ֔עְתִּי כִּ֥י מָלֹ֖ךְ תִּמְל֑וֹךְ וְקָ֙מָה֙ בְּיָ֣דְךָ֔ מַמְלֶ֖כֶת יִשְׂרָאֵֽל׃
«現在看哪，我知道你必定要作王，以色列的國必在你手裡堅立。»
Rashi
I know that you will surely reign. For I see that the Holy One, Blessed is He, saves you from my hand. The Midrash Aggadah states, that Shmuel gave him this sign, that the one who tears his robe will reign after him.12See above 15:27–28.