'Untested' in the Bible

And David said, Solomon my son is young and untested, and the house which is to be put up for the Lord is to be very great, a thing of wonder and glory through all countries; so I will make ready what is needed for it. So David got ready a great store of material before his death.

And David the king said to all the people, Solomon my son, the only one who has been marked out by God, is still young and untested, and the work is great, for this great house is not for man, but for the Lord God.