'Hard' in the Bible

Is anything too hard for Yahweh? At the set time I will return to you, when the season comes round, and Sarah will have a son."

They said, "Stand back!" Then they said, "This one fellow came in to live as a foreigner, and he appoints himself a judge. Now will we deal worse with you, than with them!" They pressed hard on the man Lot, and drew near to break the door.

They traveled from Bethel. There was still some distance to come to Ephrath, and Rachel travailed. She had hard labor.

When she was in hard labor, the midwife said to her, "Don't be afraid, for now you will have another son."