Translation:Shulchan Aruch/Orach Chaim/55
55: Laws of Kaddish.
1 We say kaddish and we do not say it with less than ten free grown men that have grown two hairs and this is also the law for kedusha and barchu which are not said with less than ten.
2 If one began to say kaddish or kedushah with ten, and a few of them left, they finish saying that kaddish or that kedushah that they began; and this is if the majority of them remained. Gloss: And in any case, it is a transgression to leave and about them is said "And they that abandon God shall be consumed" [Yerushalmi]. However, if ten remain, it is okay to leave [Mordechai, last Chapter of Megillah].
3 If one has begun with "the Fathers" and some have left, one finishes even the kedushah. Gloss: ... 4 There are those who permit saying words of kedusha with nine and with the addition of one youngster who is over the age of six and who is aware of whom they are praying to; and their words do not appear correct to the great authoritative adjudicators. And this is also the law regarding a slave and a woman, that are not asked to join. Gloss: ...
5 If he lacks two hairs, even if he is an adult in terms of age, the law is to him as to a minor until he has lived a majority of his years because then it is obvious that he is an eunuch. If the signs of being a eunuch are seen in him earlier than this, the law treats him as an adult. Gloss: And still, we are not so meticulous about the hairs; instead, anyone who has reached his years is treated as an adult and we say concerning this, probably he has brought two hairs [Rabbi Joseph Colon, Shoresh 49].
6 And if one of the ten has begun to pray alone and is unable to respond with them, or is asleep, even in this case, we consider him joined with them.
7 When one is praying alone, it is right for the others to wait to say kaddish until he has finished in order to grant him the ability as well.
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