Verse 5 from 37 practises for Bodhisattva's

When you keep their company your three poisons increase,
Your activities of hearing, thinking and meditating decline,
And they make you lose your love and compassion,
Give up bad friends. This is the practice of Bodhisattvas.

Geshe Tenzin Zopa said:

Practice no: 5 is giving up bad and negative friends. Who are
bad friends? Those friends who encourage you to indulge in
attachment, anger and ignorance. Those who distract you from
Dharma practice are negative friends. Friends who tell you it is
silly to develop loving kindness and compassion are bad friends.
Those friends have to be avoided. What type of friends should we
take as good friends? Whoever encourages you to practice the
causes to achieve the liberation and enlightenment. Someone
who is supportive of you cultivating the study, contemplation
and meditation of Dharma teachings is a good friend because it
is these practices that will result in your everlasting happiness.
Whoever encourages you to develop good heart such as loving
kindness and compassion is a virtuous friend.

Avoiding negative friends and cultivating virtuous friends are
part of the practice of the bodhisattvas. There is a teaching called
“tsung” which counsels us to avoid befriending negative minded
human beings because that will lead us to cultivating negative
actions, increase negative emotions, cause good qualities to
degenerate and in the end will only bring disappointment. This
does not mean that we condemn negative friends! No. They are
sentient beings who need our compassion and merits. But it
does mean to avoid being in their company frequently because
they influence our fragile mind towards negativity.

There is another teaching “Drenba nyensha”, which states that
as long as an object/person is the object of one’s attachment,
object of one’s hatred or object of one’s ignorance, then that is
negative and should be avoided. Giving up the homeland.

Therefore, right from the beginning, one has to be mindful
about the friends we gather. Lama Atisha advises us to ensure
we engage with right friends and avoid wrong friends. Geshe
Potowa cautioned that by mixing with negative friends, one not
only destroys this life’s benefit but also destroys the benefit of
one’s future life. This is because negative friends influence us
to cultivate non-virtuous actions of body, speech and mind and
from these come direct obstacles for us to practice dharma, for
us to achieve lasting happiness and prevent us from being able
to deliver real help to other living beings.

All the past great mahasiddhas have advised that if you really
wish for happiness, you must rely on virtuous friends. If you don’t
wish suffering, you must avoid negative companions. If a person
suggests to you that you should not attend virtuous activities but
rather, ask you to indulge in intoxicants or non-ethical activities,
that person is a negative friend to you. If one’s negative friend is
too strong in personality, then better to avoid that person. If you
think you are unable to persuade that person to enter a more
virtuous life and instead, you regard yourself weaker than that
person, you should even run away! (Laughter) Whilst we cannot
force anyone, it’s always good to foster virtuous actions. If you
discourage people from doing virtue, then you are their negative
friend.

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