'Sternly' in the Bible

And their eyes were opened. And Jesus sternly warned them: “See that no one knows this!”

Then He gave the disciples strict orders to tell no one that He was the Christ (the Messiah, the Anointed).

And Jesus [deeply moved] admonished him sternly and sent him away immediately,

Jesus commanded them not to tell anyone; but the more He ordered them, the more widely they continued to proclaim it.

The Council (Sanhedrin, Jewish High Court) took his advice; and after summoning the apostles, they flogged them and ordered them not to speak in the name of Jesus, and released them.

This description is true. So rebuke them sharply so that they will be sound in the faith and free from doctrinal error,