What is the poem that describes two people's deep feelings?

What is the poem that describes two people's deep feelings?

If the two love for a long time, and not in the morning and evening

A four character idiom to describe two people's emotional happiness

Harmony between Phoenix and Phoenix
respect
feel just like a fish in water
be on very intimate terms with each other
agree in opinion
follow like a shadow

I just want to find a famous saying or an ancient poem to express the deep feelings of people who stay for a short time but longer than that

Once the golden wind and jade dew meet, they will win the world countless