'For Us' in the Bible

Now, since we eat the salt of the palace, and it is not right for us to see the king's injury, therefore have we sent and informed the king;

And I proclaimed a fast there, at the river Ahava, that we might humble ourselves before our God, to seek of him a right way for us, and for our little ones, and for all our substance.

And the whole congregation answered and said with a loud voice, Yes, it is for us to do according to thy words.