For the phrases “I was ready to be sought out by those who did not ask, to be found by those who did not seek me,” see Romans 10:20.

Note that this quote in the New Testament is not taken from the Hebrew Bible but from the Greek Septuagint (LXX) which translates into English as “I became visible to those who were not seeking me; I was found by those who were not inquiring about me.” (Translation by NETS — for the Greek version see the title’s tooltip)