BabylonianTalmud, Sanhedrin 32b

It has been taught: Justice, justice shall you follow; the first [mention of justice] refers to a decision based on strict law; the second, to a compromise. How so? Where two boats sailing on a river meet; If both attempt to pass simultaneously, both will sink, whereas, if one makes way for the other, both can pass [without mishap]. Likewise, if two camels met each other while on the ascent to Beth-Horon; if they both ascend [at the same time] both may tumble down [into the valley]; but if [they ascend] after each other, both can go up [safely]. How then should they act? If one is laden and the other unladen, the latter should give way to the former. If one is nearer [to its destination] than the other, the former should give way to the latter. If both are [equally] near or far [from their destination,] make a compromise between them, the one [which is to go forward] compensating the other [which has to give way]. [Soncino translation]