Build there an altar1 to the LORD your God, an altar of stones. Do not use any iron tool2 upon them.
References for Deuteronomy 27:5
Build the altar of the LORD your God with fieldstones and offer burnt offerings on it to the LORD your God.
Sacrifice fellowship offerings3 there, eating them and rejoicing4 in the presence of the LORD your God.5
References for Deuteronomy 27:7