Mt.13, 24:
“The Kingdom of heaven is like this. A man sowed good seed in his field.
One night, when everyone was asleep, an enemy came and sowed weeds among the wheat and went away. When the plants grew and the heads of grain began to form, then the weeds showed up.
The man's servants came to him and said, ‘Sir, it was good seed you sowed in your field; where did the weeds come from?’ ‘It was some enemy who did this,’ he answered.
‘Do you want us to go and pull up the w...eeds?’ they asked him. ‘No,’ he answered, ‘because as you gather the weeds you might pull up some of the wheat along with them.
Let the wheat and the weeds both grow together until harvest.