Smooth stones of the brook, brook stones/ water-jacket
Extremely smooth stones, stones found on the banks of a brook.
("He took his staff in his hand and chose for himself five smooth stones from the brook and put them in the shepherd's bag that he had, in the pouch, and his sling was in his hand, and he drew near to the Philistine" — 1 Samuel 17:40).
Translation
Expression (Hebrew)
חַלּוּקֵי נַחַל, חַלּוּקֵי אֲבָנִים
Definition (Hebrew)
אֲבָנִים חֲלָקוֹת בְּיוֹתֵר, אֲבָנִים הַמְּצוּיוֹת בִּגְדוֹת נַחַל.
("וַיִּקַּח מַקְלוֹ בְּיָדוֹ וַיִּבְחַר לוֹ חֲמִשָּׁה חַלֻּקֵי אֲבָנִים מִן הַנַּחַל וַיָּשֶׂם אֹתָם בִּכְלִי הָרֹעִים אֲשֶׁר לוֹ וּבַיַּלְקוּט וְקַלְּעוֹ בְיָדוֹ וַיִּגַּשׁ אֶל הַפְּלִשְׁתִּי"- שְׁמוּאֵל א יז מ)