Reference for Avodah Zarah 12:2

הב"ע דקאי בתרי עברי נהרא דיקא נמי דקתני לא יושיט ולא קתני לא יתן ש"מ

Here we are dealing with a case of two people on opposite sides of a river.... This is also implied by the fact that it teaches “one should not hold out” and it does not teach, “one should not give.” Learn from this.

Jastrow