'Assembly' in the Bible

“Bring your worthless offerings no longer,Incense is an abomination to Me.New moon and sabbath, the calling of assemblies—I cannot endure iniquity and the solemn assembly.

“But you said in your heart,‘I will ascend to heaven;I will raise my throne above the stars of God,And I will sit on the mount of assemblyIn the recesses of the north.