"He bore the flagon to the altar, which occupied a central position in the court of the priests. Here were two silver basins, with a priest standing at each one. The flagon of water was poured into one, and a flagon of wine into the other; and the contents of both flowed into a pipe which communicated with the Kedron, and was conducted to the Dead Sea. This display of the consecrated water represented the fountain that at the command of God had gushed from the rock to quench the thirst of the children of Israel. Then the jubilant strains rang forth, “The Lord Jehovah is my strength and my song;” “therefore with joy shall ye draw water out of the wells of salvation.” Isaiah 12:2, 3 . DA 449.1"
"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."
The EGW passage describes a ritual involving water poured out at the temple, which is then connected to the water from the rock in Exodus 17:6. While not a direct quote, the connection is clear and intentional, making it a thematic parallel.