Reference for Bava Kamma 198:5
(מאי איכא) בין ת"ק לרבי נתן איכא בינייהו שכירות בין רבי נתן לר' יהודה הנשיא איכא בינייהו מלוה ופרוטה
she would not become betrothed,<span class="x" onmousemove="('comment',' V. p. 578. n. 8. ');"><sup>7</sup></span> but [if he says], 'In consideration of the hire for work which I will do for you [be betrothed to me]', she would become betrothed. R. Nathan said that if he said, 'In consideration of the hire for work I will do for you,' she would thereby not become betrothed; and all the more so in this case where he said, 'In consideration of the hire for work I have already done for you.' R. Judah the Prince, however, says: It was truly stated that whether he said, 'In consideration of the hire for the work I have already done for you,'<span class="x" onmousemove="('comment',' This was spoken to a prospective wife. ');"><sup>6</sup></span>