Isaiah 48:7

They are created now, and not from the beginning; even before the day when thou heardest them not; lest thou shouldest say, Behold, I knew them.

They are created now, and not from of old; and before this day you didn't hear them; lest you should say, Behold, I knew them.

They are created now, and not from of old; and before this day thou heardest them not; lest thou shouldest say, Behold, I knew them.

Now they have been produced and not from that time, Yea, before the day, and thou hast not heard them, Lest thou say, `Lo, I have known them.'

They are created now, and not long ago; you have not heard of them before today. So you cannot claim, ‘I already knew them!’