Verses with the word stedfast in the Apocrypha (4 verses):

Sirach 5:10
Be stedfast in thy understanding; and let thy word be the same.

Sirach 11:20
Be stedfast in thy covenant, and be conversant therein, and wax old in thy work.

Sirach 22:23
Be faithful to thy neighbour in his poverty, that thou mayest rejoice in his prosperity: abide stedfast unto him in the time of his trouble, that thou mayest be heir with him in his heritage: for a mean estate is not always to be contemned: nor the rich that is foolish to be had in admiration.

1 Maccabees 13:37
The golden crown, and the scarlet robe, which ye sent unto us, we have received: and we are ready to make a stedfast peace with you, yea, and to write unto our officers, to confirm the immunities which we have granted.