'Thing' in the Bible

When the angels left them and went back to heaven, the shepherds said to one another, "Let us go over to Bethlehem and see this thing that has taken place, that the Lord has made known to us."

but one thing is needed. Mary has chosen the best part; it will not be taken away from her."

So if you cannot do such a very little thing as this, why do you worry about the rest?

When Jesus heard this, he said to him, "One thing you still lack. Sell all that you have and give the money to the poor, and you will have treasure in heaven. Then come, follow me."