All terms in this list:
purify: to make something pure by removing harmful or dirty substances from it
gather in: to collect
tinned: food that has been preserved by being sealed in a tin
needy: someone who is poor
congregation: people who attend a church service
go round: in this case, enough food for everyone to eat
apple: A common, round fruit produced by the tree Malus domestica, cultivated in temperate climates.