1 Kings 1:17

And she said unto him, my lord, thou swarest by the Lord thy
God unto thine handmaid
Which was a very solemn oath, and binding, and which she puts David in mind of, knowing that so conscientious a man as he was would religiously observe it:

[saying], assuredly Solomon thy son shall reign after me, and shall sit
upon my throne;
be his successor in it, and established on it.