'Grieving' in the Bible

"The children who are grieving at present will yet say in your hearing, "This place is too crowded for me; make room for me, so I may have a place to live.'

‘Why have we fasted,’ they say, ‘and You do not see it?Why have we humbled ourselves and You do not notice?’Hear this [O Israel], on the day of your fast [when you should be grieving for your sins] you find something you desire [to do],And you force your hired servants to work [instead of stopping all work, as the law teaches].