1 Kings 18:30-33

30Then Elijah said to all the people, “Come here to me.” They came to him, and he repaired the altar of the LORD, which had been torn down. 31Elijah took twelve stones, one for each of the tribes descended from Jacob, to whom the word of the LORD had come, saying, “Your name shall be Israel.” 32With the stones he built an altar in the name of the LORD, and he dug a trench around it large enough to hold two seahs That is, probably about 24 pounds or about 11 kilograms of seed.

33He arranged the wood, cut the bull into pieces and laid it on the wood. Then he said to them, “Fill four large jars with water and pour it on the offering and on the wood.”