'Solemn' in the Bible

In solemn truth I tell you that all their sins may be pardoned to the sons of men, and all their blasphemies, however they may have blasphemed;

Heaving a deep and troubled sigh, He said, "Why do the men of to-day ask for a sign? In solemn truth I tell you that no sign will be given to the men of to-day."

He went on to say, "In solemn truth I tell you that some of those who are standing here will certainly not taste death till they have seen the Kingdom of God already come in power."

In solemn truth I tell you that no one who does not receive the Kingdom of God like a little child will by any possibility enter it."

"In solemn truth I tell you," replied Jesus, "that there is no one who has forsaken house or brothers or sisters, or mother or father, or children or lands, for my sake and for the sake of the Good News,

In solemn truth I tell you that if any one shall say to this mountain, 'Remove, and hurl thyself into the sea,' and has no doubt about it in his heart, but stedfastly believes that what he says will happen, it shall be granted him.

So He called His disciples to Him and said, "In solemn truth I tell you that this widow, poor as she is, has thrown in more than all the other contributors to the Treasury;

I tell you in solemn truth that the present generation will certainly not pass away without all these things having first taken place.