In Parshat Chayai Sarah, Perek 24; Pasuk 3, while Avraham is telling Eliezer his mission of choosing a wife for Yitzchak, Avraham says;
"And I will adjure you by the Lord, the God of the heaven and the God of the earth, that you will not take a wife for my son from the daughters of the Canaanites..."
However, Later in Pasuk 7, Avraham says "The Lord, God of the heavens, Who took me from my father's house and from the land of my birth..."
Why does Avraham first refer to Hashem as "God of the heaven and the God of the earth", and then refer to Hashem as the God of the heavens (only)???
Rashi: 24;7
ה' אלהי השמים אשר לקחני מבית אבי: ולא אמר ואלהי הארץ, ולמעלה אמר (פסוק ג) ואשביעך בה' אלהי השמים ואלהי הארץ. אמר לו עכשיו הוא אלהי השמים ואלהי הארץ, שהרגלתיו בפי הבריות, אבל כשלקחני מבית אבי היה אלהי השמים ולא אלהי הארץ, שלא היו באי עולם מכירים בו, ושמו לא היה רגיל בארץ
Where else in the Torah are these different names of Hashem used, and why? Is it necessary to describe Hashem while making a vow? Avraham also strengthens this vow by having Eliezer touch his thigh, is this another part of the format of the vow? If so, what is the significance?
(EC: connect this Rashi to Rashi on Shema Yisrael. -Ms. Laufer)