Reference for Sotah 88:17

ור' שמעון אי כתב רחמנא זקני הוה אמינא אפי' זקני השוק כתב רחמנא זקניך ואי כתב רחמנא זקניך הוה אמינא אפי' סנהדרי קטנה כתב רחמנא ושופטיך למיוחדין שבשופטיך

The wars waged by Joshua to conquer [Canaan] were obligatory in the opinion of all; the wars waged by the House of David for territorial expansion were voluntary in the opinion of all; where they differ is with regard to [wars] against heathens so that these should not march against them. One<span class="x" onmousemove="('comment',' R. Judah. ');">¹⁵</span>

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