Quoting Commentary for II Kings 4:17

ישפוט ה' ביני וביניך, “may the Lord judge between me and you.” Our sages in Bereshit Rabbah 45,5 state that if one invokes the attribute of Justice against a fellow human being one will not emerge from such a confrontation completely unharmed. But for the fact that Sarai invoked the attribute of Justice she would have lived to the same age as Avraham. Because she appealed to the attribute Justice in her quarrel with Avram she lost 48 years of her life.
Rabbi Aushiyah added that seeing that at the time when Sarai said: “let the Lord judge between me and you,” Hagar was already pregnant with child seeing the Torah said ויבא אל הגר ותהר, what was the point of the angel announcing to Hagar (verse 11) “here you are pregnant and you will give birth to a son?” He should only have told her hat she would bear a son. We learn from this line that Sarai had looked at Hagar with the evil eye and she had aborted her fetus.” Rabbi Chanina added that if the prophet Elisha had made such a statement under the influence of the Holy Spirit that would have been sufficient [a reference to Kings II 4,17 where he predicted that the Shunamite woman would embrace a son a year from the time of the prophecy. On that occasion the Shunamite woman suspected the prophet of raising her hopes in vein. Ed.] Thus far the comment of Bereshit Rabbah.

שוב אשוב אליך, “I will definitely come back to you to visit);” the angel speaks about two separate occasions when he will return; one in Tishrey, the other in Nissan. [According to Rabbi Chavell’s annotation, these words need to be understood in conjunction with verse 12; the prediction of the angels was made in Nissan, and when by the time of the month of Tishrey, Sarah had not experienced signs of pregnancy she despaired. At that point G-d [when the angel returned the first time. Ed.] challenged her attitude asking Avraham why she made fun of the prediction. The prediction was repeated, confirmed, and by Nissan of the year Sarah had become a mother. כעת חיה, [usually translated as “at this time next year,” Ed.]. The expression is so unusual that we must revert to the fact that angels live forever. Were it not for that fact, how did they know that it was in their power to return again, maybe they would have died in the interval? This must be contrasted with a similar statement by the prophet Elisha who was a mortal human being and who promised only “at this time next year,” without mentioning that he would return to witness this fact. (Compare Kings II 4,17 and mentioned by Rashi there.)