'Fast' in the Bible

Then Jael Heber's wife took a nail of the tent, and took an hammer in her hand, and went softly unto him, and smote the nail into his temples, and fastened it into the ground: for he was fast asleep and weary. So he died.

And they spake unto him, saying, No; but we will bind thee fast, and deliver thee into their hand: but surely we will not kill thee. And they bound him with two new cords, and brought him up from the rock.

And he said unto her, If they bind me fast with new ropes that never were occupied, then shall I be weak, and be as another man.

And all the sons of Israel go up, even all the people, and come in to Beth-El, and weep, and sit there before Jehovah, and fast on that day till the evening, and cause to ascend burnt-offerings and peace-offerings before Jehovah.