The seventh aliyah discusses the two rows of six loaves each for a total of twelve loaves of "lechem hapanim", or "Showbread" to be put on the pure table in the Mishkan every Shabbos. You'll find this same text as part of the Shabbos morning prayers on page 201 of the siddur Tehillat Hashem to be said at the end of davening after Aleinu.
These twelve loaves are the reason we use two challahs on Shabbos, each braided with six braids for a total of twelve, and each of these twelve braids correspond to one of the loafs of Showbread.
This aliyah then tells the story of a man of a Jewish mother and an Egyptian father. Since he doesn't have a Jewish father he's in a predicament when it comes to finding a tribe with which to pitch his tent because the tribes go by the father. So he winds up blaspheming G-d over his situation. Actually, Rashi says that this man's father was the Egyptian that Moshe killed in Egypt right before Moshe fled Egypt to go to Midian.
