'Fast' in the Bible

And Jehovah said unto Satan, Hast thou considered my servant Job? for there is none like him in the earth, a perfect and an upright man, one that feareth God, and turneth away from evil: and he still holdeth fast his integrity, although thou movedst me against him, to destroy him without cause.

Then said his wife unto him, Dost thou still hold fast thine integrity? renounce God, and die.

He shall lean upon his house, but it shall not stand: He shall hold fast thereby, but it shall not endure.

And thou hast laid fast hold on me, which is a witness against me : And my leanness riseth up against me, It testifieth to my face.

My foot hath held fast to his steps; His way have I kept, and turned not aside.

My righteousness I hold fast, and will not let it go: My heart shall not reproach me'so long as I live.

When the dust runneth into a mass, And the clods cleave fast together?