'Sorrow' in the Bible

Take no leavened bread with it; for seven days let your food be unleavened bread, that is, the bread of sorrow; for you came out of the land of Egypt quickly: so the memory of that day, when you came out of the land of Egypt, will be with you all your life.

And among these nations shalt thou find no ease, neither shall the sole of thy foot have rest: but the LORD shall give thee there a trembling heart, and failing of eyes, and sorrow of mind:

So that there may not be among you any man or woman or family or tribe whose heart is turned away from the Lord our God today, to go after other gods and give them worship; or any root among you whose fruit is poison and bitter sorrow;

For thirty days the children of Israel were weeping for Moses in the table-lands of Moab, till the days of weeping and sorrow for Moses were ended.