'Truth' in the Bible

Now therefore, please swear to me by the Lord, since I have dealt kindly with you, that you also will deal kindly with my father’s household, and give me a pledge of truth,

And the men say to her, 'Our soul for yours -- to die; if ye declare not this our matter, then it hath been, in Jehovah's giving to us this land, that we have done with thee kindness and truth.'

And Achan answered Joshua, and said, Of a truth I have sinned against Jehovah, the God of Israel, and thus and thus have I done:

"El, God, the Lord! El, God, the Lord! He knows the truth! Israel must also know! If we have rebelled or disobeyed the Lord, don't spare us today!

Now therefore fear the LORD, and serve him in sincerity and in truth: and put away the gods which your fathers served on the other side of the flood, and in Egypt; and serve ye the LORD.