'Assuredly' in the Bible

Go and get thee in unto king David, and say unto him, Didst not thou, my lord, O king, swear unto thy handmaid, saying, Assuredly Solomon thy son shall reign after me, and he shall sit upon my throne? why then doth Adonijah reign?

And she said unto him, My lord, thou swarest by Jehovah thy God unto thy handmaid,'saying , Assuredly Solomon thy son shall reign after me, and he shall sit upon my throne.

verily as I sware unto thee by Jehovah, the God of Israel, saying, Assuredly Solomon thy son shall reign after me, and he shall sit upon my throne in my stead; verily so will I do this day.