According to Genesis 12:6-7 Abram (Abraham) had stopped at Shechem and the LORD appeared to him saying, "To your descendants I will give this land." It was here that Abram built an altar to the LORD. Several commentaries say this is the first true place of worship ever erected in the Promised Land.
He was the first to worship and teach about the one God.
Genesis 22:5 - And Abraham said to his young men, "Stay here with the donkey; the lad and I will go yonder and worship, and we will come back to you." [NKJV]
The Torah says that Abraham was the first Hebrew to start worshipping God. This was around 2000 BCE.
Because they knew it was the House of Abraham. Their history recorded that Abraham and his first born son, Ishmael had built it for the worship of the One God. In fact, it was the first house of worship for the One God built on Earth, according to the Qur'an. The Meccans, before Muhammad, believed in the One God of Abraham; but they mistakenly fell into the belief in other false gods, as well.
The House of Almighty Allah known as Ka'abah is the house of worship that Muslims believe that Abraham helped Ishmael build in Mecca.
Baha'is worship the God of Abraham.
Abraham repudiated the Mesopotamian idolatry while still in his youth, and instituted the worship of One God, creator of the universe; a worship that has survived and spread to this day.http://judaism.answers.com/jewish-history/a-biography-of-abraham
No law was ever "shown" to Abraham. Tradition holds that G-d spoke to Abraham and revealed himself, and Abraham worked out for himself how to worship G-d.
He practice the worship of monotheism, the practice or worship of only one god.
abraham promised him a child to love and worship.
the Khana Kaba
Abraham promised to god that he would only worship one god. P.S. you misspelled Abraham : )