大般涅槃經義記 9.124

9.124

第二次明退來入胎。於中，初明兜率退時大地振動，下以二義釋動所以，文顯可知。入胎、住胎、出胎可解，餘略不論。

Second, it next explains descending to enter the womb. Within this, it first explains that when he descended from Tuṣita, the great earth trembled, and below it explains the reason for the trembling through two meanings; the text is clear and easily understood. Entering the womb, dwelling in the womb, and exiting the womb can be understood; the rest is omitted and not discussed.