Exodus 23:17 KJV
Three times in the year all thy males shall appear before the Lord God.
Exodus 23:17, King James Version
In context
16 And the feast of harvest, the firstfruits of thy labours, which thou hast sown in the field: and the feast of ingathering, which is in the end of the year, when thou hast gathered in thy labours out of the field.
17 Three times in the year all thy males shall appear before the Lord God.
18 Thou shalt not offer the blood of my sacrifice with leavened bread; neither shall the fat of my sacrifice remain until the morning.