Ex 29:42-46 concludes with a wonderful statement of God's purpose in bringing the people of Israel out of Egypt. Apparently it was so that He might be able to 'dwell among them'. This is an important focus. So often we focus on the phrase 'brought them out that he might bring them in'. There is truth in the statement although it needs another step in it; 'he brought them out to bring them to himself and then bring them in..' This concluding sentence of Exodus 29 is the key truth; I am the LORD their God, who brought them up out of the land of Egypt, that I may dwell among them. I am the LORD their God.
Covenant points towards relationship and of a relationship that has a specific beginning. There can be no 'covenant' without a beginning, but beginnings have no guarantee of permanency unless there is a 'covenant'. In that the whole story of the Bible is about relationships, the way that they are created, broken and restored, it is a wonderful topic for consideration.
The Codex Sinaiticus is a Greek hand-written manuscript of the Old and New Testaments. It was written in the 4th century, in uncial letters. It came to the attention of scholars in the 19th century at the Greek Monastery of Mount Sinai, with further material discovered in the 20th century, and most of it is today in the British Library.
For many the whole area of Bible Texts and original manuscripts is just an unintelligible minefield. To help you understand more about the CS I recommend the following links: