Hi Feif Un,
It’s a good thing you forgot who the Tanna was, since it was a far eastern king judging with Alexander The Great observing.
The eastern ruler gave that advice, to marry their children to each other, while Alexander commented that if would have killed them both and taken the money for himself. The eastern king asked Alexander if it rains in his land, and he to which he replied, yes. there He then asked if there are goats in his land. When he said yes, the former replied, well then it rains in their merit.