Blood in heaven?

5 Even unto them will I give in mine house and within my walls a place and a name better than of sons and of daughters: I will give them an everlasting name, that shall not be cut off.

6 Also the sons of the stranger, that join themselves to the Lord, to serve him, and to love the name of the Lord, to be his servants, every one that keepeth the sabbath from polluting it, and taketh hold of my covenant;

7 Even them will I bring to my holy mountain, and make them joyful in my house of prayer: their burnt offerings and their sacrifices shall be accepted upon mine altar; for mine house shall be called an house of prayer for all people.

I understood verse 4 to be talking about the reward of heaven for those who sacrifice this life for slide of service. Why does it sound then like they're are burnt offerings and sacrifices in heaven (verse 7)

No blood in heaven. Does not the Lord say that He wants obedience and not sacrifice?