Derek,
>>> yesaƱca = yesa.m [plural Gen/Dat of ya/ya.m] + ca
> yesa.m ... tesa.m ... = of whomsoever ... their ...
That's the bit I don't understand ... whom or what is the genitive or
dative plural referring to?<<

Yesa.m and tesa.m are genitives refering to the requisites. This is seen
clearer when the alternate reading in the Thai, Sihala, and Khmer versions
is used which ends in -aana.m (i.e. the gen pl).

>>Again, what's this genitive/dative plural (amhaaka.m) all about? Of
us? For us?<<

Amhaaka.m is referring to the we (maya.m), i.e. the monks. 'Of us'. >> Our

Hope you guys don't mind me butting in every once in a while.

Sean