Midrash for Chullin 268:55

קבה כמשמעה וכן הוא אומר (במדבר כה, ח) ואת האשה אל קבתה

represents the hand [of Phinehas], for it is written: And took a spear in his hand.<span class="x" onmousemove="('comment',' Ibid. 7. Presumably in his right hand, consequently it is the right shoulder that is to be given.');">³⁵</span>

Sifrei Devarim