Exodus 17:6
JPS-1917הִנְנִ֣י עֹמֵד֩ לְפָנֶ֨יךָ שָּׁ֥ם ׀ עַֽל־הַצּוּר֮ בְּחֹרֵב֒ וְהִכִּ֣יתָ בַצּ֗וּר וְיָצְא֥וּ מִמֶּ֛נּוּ מַ֖יִם וְשָׁתָ֣ה הָעָ֑ם וַיַּ֤עַשׂ כֵּן֙ מֹשֶׁ֔ה לְעֵינֵ֖י זִקְנֵ֥י יִשְׂרָאֵֽל׃
Behold, I will stand before thee there upon the rock in Horeb; and thou shalt smite the rock, and there shall come water out of it, that the people may drink.’ And Moses did so in the sight of the elders of Israel.
Rashi Commentary
והכית בצור AND THOU SHALT SMITE THE ROCK — It does not say here “thou shalt smite על הצור”, upon the surface of the rock, but בצור, right into the rock — from this it follows that the rod must have been composed of a kind of hard material the name of which is sapphire, and the rock was split by it (Mekhilta).
Other Translations
הִנְנִ֣י עֹמֵד֩ לְפָנֶ֨יךָ שָּׁ֥ם ׀ עַֽל־הַצּוּר֮ בְּחֹרֵב֒ וְהִכִּ֣יתָ בַצּ֗וּר וְיָצְא֥וּ מִמֶּ֛נּוּ מַ֖יִם וְשָׁתָ֣ה הָעָ֑ם וַיַּ֤עַשׂ כֵּן֙ מֹשֶׁ֔ה לְעֵינֵ֖י זִקְנֵ֥י יִשְׂרָאֵֽל׃
Behold, I will stand before thee there upon the rock in Ḥorev; and thou shalt smite the rock, and there shall come water out of it, that the people may drink. And Moshe did so in the sight of the elders of Yisra᾽el.