And that

Leviticus 23:4
These are the LORD's appointed feasts, the sacred assemblies you are to proclaim at their appointed times.

in Jerusalem

Deuteronomy 16:16
Three times a year all your men are to appear before the LORD your God in the place He will choose: at the Feast of Unleavened Bread, the Feast of Weeks, and the Feast of Tabernacles No one should appear before the LORD empty-handed.

the mount

Judges 9:48, 49
he and all his men went up to Mount Zalmon. Abimelech took his ax in his hand and cut a branch from the trees, which he lifted to his shoulder, saying to his men, "Hurry and do what you have seen me do." . . .

Matthew 21:1
As they drew near to Jerusalem and came to Bethphage on the Mount of Olives, Jesus sent out two disciples.

fetch

Leviticus 23:40
On the first day you are to gather the branches of majestic trees--palm branches and boughs of leafy trees and willows of the brook--and rejoice before the LORD your God for seven days.

olive

Genesis 8:11
And behold, the dove returned to him in the evening with a freshly plucked olive leaf in her beak. So Noah knew that the waters had receded from the earth.

palm

John 12:13
They took palm branches and went out to meet Him, shouting: "Hosanna!" "Blessed is He who comes in the name of the Lord!" "Blessed is the King of Israel!"

Revelation 7:9
After this I looked and saw a multitude too large to count, from every nation and tribe and people and tongue, standing before the throne and before the Lamb. They were wearing white robes and were holding palm branches in their hands.