Oznayim la'Torah: Because in Ki Sissa, he evoked the oath - which concerned Yisrael's eternal existence - whilst the threat of annihilation was hanging over their heads - to prevent Hashem from carrying out the threat; whereas here, when Hashem had already rescinded the initial decree, and had agreed to tke the children into Cana'an, it was no longer necessary to mention it.

Kol Eliyahu: He asked that the Avos atone for them. The first letters of their names is 'Alef' 'Yud' 'Yud', which is equivalent to the first letters of the three names of Hashem in the Pasuk "Sh'ma Yisrael." The second letters are 'Beis' 'Tzadi' 'Ayin', corresponding to Tefilah ? "Erev va'Voker ve'Tzaharayim Asichah" (Tehilim 55:18). The third letters, 'Reish' 'Ches' 'Kuf', are the initial letters of 'K'shi' ? 'Rish'o' ? 'Chataso', and the fourth letters, 'Mem' ¹ 'Kuf' 'Beis', correspond to the Pesukim of Kedushah ? Kadosh?, Baruch (K'vod) and YiMloch.