אם אני, אם זה, טעמו במקום שי"ן השמוש, כאלו אמר שאני שאתה, וכן עד אם כלו לשתות (כ"ד י"ט) עד...אם אני, the expression אם אני and אם אתה in this verse must be understood as if the Torah had written שאני and שאתה, “that I,“ “that you.” We find the word אם used in that sense in Genesis 24,19 עד אם כלו לשתות, “until they have finished drinking,” as we pointed out there.
אני בקמץ שלא במקום הפסק אבל הוא בהעמדת טעם, וכן אף אני בכור אתנהו (תהלים פ"ט), ברכני גם אני (כ"ז ל"ד). אני, the word is spelled with the vowel kametz although it does not signify a comma or other interruption of the subject matter under discussion. It is to be understood as in Psalms 89,28 in אף אני-בכור אתנהו, “I will even consider him as a firstborn.” The long vowel kametz lends emphasis to the word. So it does in our verse, and so it does in Genesis 27,34 ברכני גן אני אבי, “bless me also father!” Esau pleaded: “I too need a blessing.”
ואת המצבה, אשר הצבת אתה לעד ולברית ביני ובינך כי המצבה הרים יעקב והגל עשו שניהם לפיכך זכר המצבה באמרו ליעקב ואם אתה. והיאך היה לבן מפייס ממנו, והלא אמר יש לאל ידי לעשות עמכם רעה, אלא שראה כי אלהים עם יעקב בכל אשר עושה והזהירו עליו ואמר השמר לך, לפיכך ירא ממנו ובקש ממנו ברית, כמו שאמר אבימלך ליצחק, ראה ראינו כי היה ה' עמך, תהי נא אלה וגו': ואת המצבה הזאת, which you have erected as a witness and sign of the covenant between you and me. Yaakov had erected the monument, whereas both had he and Lavan had combined to set up the pile of stones described as גל. This is why he mentioned the מצבה when saying to Yaakov ואם אתה, we must wonder altogether that Lavan was now prepared to make his peace with Yaakov, having obtained nothing in return for his pursuit. The fact is that although he had boasted that he possessed the power to harm Yaakov, he had realised that Yaakov’s G’d not only had assisted him in the past, but had given him, Lavan personally, notice not even to harass Yaakov. This is why now he begged for a peace agreement, as had Avimelech when be asked for such an agreement from Yitzchok after first having expelled him from Gerar. Avimelech had also acknowledged in front of his general that they had convinced themselves that G’d was on the side of Yitzchok (26,28)