'Solemn' in the Bible

for I have five brothers—in order that he may solemnly warn them and witness to them, so that they too will not come to this place of torment.’

Since it was the day of Preparation [for the Sabbath], in order to prevent the bodies from hanging on the cross on the Sabbath (for that Sabbath was a high holy day) the Jews asked Pilate to have their legs broken [to hasten death] and the bodies taken away.

He commanded us to preach to the people [both Jew and Gentile], and to solemnly testify that He is the One who has been appointed and ordained by God as Judge of the living and the dead.