Reference for Kiddushin 14:6
שני חצייך בפרוטה מהו הכא ודאי בחד זימנא קאמר לה או דילמא אין אשה מתקדשת לחצאין כלל תיקו :
Since he said to her, 'To-morrow,' he divided it; or perhaps he meant thus: the kiddushin commence immediately, but shall not be completed until to-morrow? [Further,] what [if he says], 'Thy two halves for a perutah': here he certainly proposed to her in once; or perhaps a woman cannot be betrothed at all by halves?
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