{He received a cup} (dexamenos pot(8872)ion). This cup is a
diminutive of pot(8872). It seems that this is still one of the
four cups passed during the passover meal, though which one is
uncertain. It is apparently just before the formal introduction
of the Lord's Supper, though he gave thanks here also
(eucharist(8873)as). It is from this verb euchariste(935c) (see also
verse  19 ) that our word Eucharist comes. It is a common verb
for giving thanks and was used also for "saying grace" as we call
it.