King James Version
Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said, To day if ye will hear his voice, harden not your hearts.New International Version
Therefore God again set a certain day, calling it Today, when a long time later he spoke through David, as was said before: "Today, if you hear his voice, do not harden your hearts."Catholic Public Domain Version
Again, he defines a certain day, after so much time, saying in David, "Today," just as it was stated above, "If today you hear his voice, harden not your hearts.