"3 A voice cries: 'In the wilderness prepare the way of the LORD; make straight in the desert a highway for our God.'"
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I didn't notice this until I looked at the notation, but the first syllables of one instance of "iniquity" and "pardoned" have accidentals:
The accidental on "iniquity" pretty clearly indicates the error inherent in sin, but the accidental on "pardoned" took me a while to suss out. It might just be there to make the melody that Handel wanted (as could the accidental on "iniquity"), but it might also be indicative of redemption: in the same way that Christ had to take on sin to redeem people from their sins, "pardoned" has an accidental like "iniquity." Musically, it illustrates what is sung later: "with his stripes we are healed."