יא רב מתנה אמר מהכא (דברים כח, מז) תחת אשר לא עבדת את ה' אלהיך בשמחה ובטוב לבב איזו היא עבודה שבשמחה ובטוב לבב הוי אומר זה שירה ואימא דברי תורה דכתיב (תהלים יט, ט) פקודי ה' ישרים משמחי לב משמחי לב איקרי טוב לא איקרי
11 Do not read 'yasor', but 'yashir' [he sang]. Belvati, in the name of R'Johanan inferred it from here: To do the work of service.<span class="x" onmousemove="('comment',' Num. IV, 47. The song required the service of the sacrifice, at the libations of which the trumpets sounded,');"><sup>22</sup></span> Which work needs [depends on] service? Say: That is the song. R'Isaac inferred it from here: Take up the melody, and sound the timbrel, the sweet harp with the psaltery.<span class="x" onmousemove="('comment',' Ps. LXXXI, 3.');"><sup>23</sup></span> R'Nahman B'Isaac derived it from here: Those yonder lift up their voice, they sing for joy; for the majesty of the Lord they shout from the sea.<span class="x" onmousemove="('comment',' Isa. XXIV, 14.');"><sup>24</sup></span> One Tanna derived it from here: But unto the sons of Kohath he gave none, because the service of the holy things belonged unto them: they bore them upon their shoulders.<span class="x" onmousemove="('comment',' Num. VII, 9.');"><sup>25</sup></span> Would I not have known from the meaning of 'upon their shoulders', that they bore them?