Matthew 5:44-45:

But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
That ye may be the children of your Father which is in heaven: for he maketh his sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust.

See also:

Objection: It Rains on the Just as Well as the Unjust (Matthew 5:45)