Hebrews 9:4-5

4 The gold altar for incense was in there. The Covenant Box was there too. The box had gold on all its sides. Inside the box was the gold pot that contained the special food called manna. The box also contained Aaron's stick that had grown leaves. It also contained the two flat stones on which God had written the rules of his agreement with his people. 5 The shapes of two special angels stood on the top of the box. They were made from gold and they showed that God was there with great power. The angels held out their wings over the lid of the box. That lid was the place where God forgave the people's sins. But we cannot explain everything about these things now.

9:4Exodus 30:1-10 describes the gold table where they burned incense.
9:4Exodus 25:10-22 describes the special Covenant Box.
9:4Exodus 16:14-31 describes how God supplied manna for Israel's people to eat in the wilderness. Exodus 16:32-34 describes how Aaron put some of this special food in a pot to keep it.
9:4Numbers 17:1-11 describes how Aaron's stick grew leaves, flowers and fruit. This showed people that God had really chosen Moses and Aaron to be the leaders of Israel's people.