Who says the following and why? They bring in their own calves and lambs to feast the friends of the bride-to-be, yes, and shower her with gleaming gifts as well. They don't devour the woman's goods scot-free.

It is said by Athena who took the shape of Eurynome. She makes Penelope look even better and makes her talk to the suitors. That is because she knows what's brewing and knows that the suitors days are numbered and that Odysseus will reunite with Penelope. Everyone knows it more or less or feels it.