"These are the four drains on one's store of wealth: being debauched in sex; being debauched in drink; being debauched in gambling; and having evil people as friends, associates, and companions. Just as if there were a great reservoir with four inlets and four drains, and a man were to close the inlets and open the drains, and the sky were not to pour down proper showers, the depletion of that great reservoir could be expected, not its increase. In the same way, these are the four drains on one's store of wealth: being debauched in sex, being debauched in drink, being debauched in gambling, and having evil people as friends, associates, and companions."
— AN 8.54
"These four, young householder, should be understood as foes in the guise of friends: he who appropriates a friend's possessions, he who renders lip-service, he who flatters, he who brings ruin...
The friend who appropriates,
the friend who renders lip-service,
the friend that flatters,
the friend who brings ruin,
these four as enemies the wise behold,
avoid them from afar as paths of peril...
"These four, young householder, should be understood as warm-hearted friends: he who is a helpmate, he who is the same in happiness and sorrow, he who gives good counsel, he who sympathises...
The friend who is a helpmate,
the friend in happiness and woe,
the friend who gives good counsel,
the friend who sympathises too —
these four as friends the wise behold
and cherish them devotedly
as does a mother her own child."
— DN 31