וְעַתָּה֙ הִנֵּ֣ה יָדַ֔עְתִּי כִּ֥י מָלֹ֖ךְ תִּמְל֑וֹךְ וְקָ֙מָה֙ בְּיָ֣דְךָ֔ מַמְלֶ֖כֶת יִשְׂרָאֵֽל׃
At ngayon, narito, alam ko na tiyak na ikaw ay maghahari, at matatatag sa iyong kamay ang kaharian ng Israel.
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.