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

Sirach 44:21
Therefore he assured him by an oath, that he would bless the nations in his seed, and that he would multiply him as the dust of the earth, and exalt his seed as the stars, and cause them to inherit from sea to sea, and from the river unto the utmost part of the land.

Sirach 49:10
And of the twelve prophets let the memorial be blessed, and let their bones flourish again out of their place: for they comforted Jacob, and delivered them by assured hope.

2 Maccabees 7:24
Now Antiochus, thinking himself despised, and suspecting it to be a reproachful speech, whilst the youngest was yet alive, did not only exhort him by words, but also assured him with oaths, that he would make him both a rich and a happy man, if he would turn from the laws of his fathers; and that also he would take him for his friend, and trust him with affairs.

2 Maccabees 12:25
So when he had assured them with many words that he would restore them without hurt, according to the agreement, they let him go for the saving of their brethren.