1 Sam 28:1

וַֽיְהִי֙ בַּיָּמִ֣ים הָהֵ֔ם וַיִּקְבְּצ֨וּ פְלִשְׁתִּ֤ים אֶת־מַֽחֲנֵיהֶם֙ לַצָּבָ֔א לְהִלָּחֵ֖ם בְּיִשְׂרָאֵ֑ל וַיֹּ֤אמֶר אָכִישׁ֙ אֶל־דָּוִ֔ד יָדֹ֣עַ תֵּדַ֗ע כִּ֤י אִתִּי֙ תֵּצֵ֣א בַֽמַּחֲנֶ֔ה אַתָּ֖ה וַאֲנָשֶֽׁיךָ׃

Now in those days the Philistines gathered their forces for warfare against Israel. So Achish said to David, “You must understand that you and your men are to go out to battle with me.”