Ex 3:15: "And God saith again unto Moses, 'Thus dost thou say unto the sons of Israel, Jehovah, God of your fathers, God of Abraham, God of Isaac, and God of Jacob, hath sent me unto you; this is My name -- to the age, and this My memorial, to generation -- generation." (YLT)
Ex 12:14: "This day shall be for you a memorial day, and you shall keep it as a feast to the Lord; throughout your generations, as a statute forever, you shall keep it as a feast." (ESV)
Ex 32:5: "And when Aaron saw it, he built an altar before it; and Aaron made proclamation, and said, To morrow is a feast to the LORD." (KJV)
Ex 32:5: "And Aaron seeth, and buildeth an altar before it, and Aaron calleth, and saith, 'A festival to Jehovah -- to-morrow;'" (YLT)
See Exodus 10:9; 13:6, 9; 17:14; 23:15-18; 28: 12, 29; 30:16; 34:18, 22, 25; 39:7.