He Strengthened Himself After His Wifes Death

Rav Zev Wolf of Strikov zy”a (Sefer Zer Zahav) explains that after the difficult test of the akeidah, Avrohom heard an angel say that it was known that he was a man who fears Hashem and, therefore, he would have many offspring who would be blessed with all good things. However, when he returned home, he was met with the tragedy of seeing that Sarah, his dear wife, had passed away. This created an opportunity for the yeitzer hara to attempt to confuse him and lead his thoughts astray.

Therefore, the pasuk testifies that “Avrohom got up”, meaning that he stood up on his feet and kept full control over his thoughts, never questioning the ways of Hashem and fully accepting that whatever He does is for the good.