There is a widespread custom among the Jewish people to fill up their kiddush cup to the point that it overflows. This overflowing of wine symbolizes Hashems blessing overflowing in our lives. I was told by someone that this wine is compared to the wine that we spill out during Pesach for the ten makkos which al pi kaballah is a high level of klippah and shouldnt even be touched let alone drunk.
Question: What if any is the source that one should not drink the wine that spills out of the kiddush cup as described above.
R. Hanin b. Papa stated: A person in whose house wine is not poured like water has not
attained the state of blessedness;
for it is said: And he will bless thy bread and thy water (Mishpatim 23:25) as the 'bread' is food that may be bought with
the money of the Second Tithe so is the 'water' a liquid that may be
bought with the money of the Second Tithe. Now such a liquid is of
course wine, and yet is called 'water'. If therefore, it is poured in
one's house like water that house has attained to the state of
blessedness, otherwise it has not.
I think the underlying idea of the bruchah is that your wine should be as plentiful as the water in your house, of which you wouldn't care if some spilled since you have so much of it. Therefore, I would think you should not drink the spilled wine since then you are implying that your wine is not as plentiful as water, and you do care if some of it goes to waste.