I will bind you by an oath to G-d, G-d of heaven and G-d of the earth, not to take a wife for my son from among the daughters of the Canaanites in whose midst I live.
Genesis 24:3
Abraham calls G-d here the G-d of both heaven and earth, whereas when he later describes his original entry into the Land of Israel, he calls G-d only the G-d of heaven.
This is because typically, people are initially only prepared to accept the existence of an abstract, remote “G-d of heaven.” The idea of an intimate, personal “G-d of the earth,” who may encroach upon our private lives, can be much more intimidating. It was thanks to Abraham’s educational efforts that his disciples eventually became ready to accept the existence of a “G-d of the earth,” who is present within all aspects of reality and is concerned with our personal lives, as well.
Our challenge, too, is to ensure that G-d be just as much the “G-d of the earth” as He is the “G-d of heaven,” i.e., that we be just as conscious of Him when we engage in our physical pursuits as we are when we engage in explicitly spiritual activities.
--Daily Wisdom Vol. 3