'Solemn' in the Bible

"When I passed by you again, I looked at you, and noticed that it was your proper time for love. I spread my cloak over you to cover your nakedness. I made a solemn promise to you and entered into a covenant with you," declares the Lord GOD. "You belong to me.

And it will be to them like a false divination in their eyes; they have sworn solemn oaths. But he brings iniquity to remembrance, that they may be seized.

As the holy flock, as the flock of Jerusalem in her solemn feasts; so shall the waste cities be filled with flocks of men: and they shall know that I am the LORD.

They shall eat the grain offering, the sin offering and the guilt offering; and every devoted thing (offering) in Israel [dedicated by a solemn vow to God] shall be theirs.

But when the people of the land shall come before the LORD in the solemn feasts, he that entereth in by the way of the north gate to worship shall go out by the way of the south gate; and he that entereth by the way of the south gate shall go forth by the way of the north gate: he shall not return by the way of the gate whereby he came in, but shall go forth over against it.

“At the feasts and the appointed festivals the grain offering shall be an ephah with a bull and an ephah with a ram, and with the lambs as much as one is able to give, and a hin of oil with an ephah.