Question

Which quotation from a Shakespearean sonnet is a couplet?

“And yet by heaven, I think my love as rare, / As any she belied with false compare.”
“Where art thou, Muse, that thou forget'st so long / To speak of that which gives thee all thy might?”
“Rise, resty Muse, my love's sweet face survey, / If Time have any wrinkle graven there; / If any, be a satire to decay, / And make Time's spoils despised every where.”
“My mistress' eyes are nothing like the sun; / Coral is far more red, than her lips red: / If snow be white, why then her breasts are dun; / If hairs be wires, black wires grow on her head.”

Answer 1

“And yet by heaven, I think my love as rare, / As any she belied with false compare.”

It's the two-line closing couplet of Sonnet 130 — two lines that form a rhyming pair.