The saying is, “Be careful what you wish for. You might get it”. This is true, not only for wishes but one should be careful about everything he says.
Since Moshe Rabbenu was born his name appears in every Sidra except in this week’s Portion. (Excluding the Book of Deuteronomy where it is missing from four Portions,) The Bal HaTurim, a commentary on the Torah gives a unique reason.
When the Children of Israel sinned in the Wilderness, Hashem said to Moshe He will exterminate them all and build a new nation from Moshe’s descendants. (See Ex.32,10) Moshe pleaded that Hashem should forgive the people, or else,: מְחֵנִי נָא מִסִּפְרְךָ אֲשֶׁר כָּתָבְתָּ, “…erase me now from this book that You have written”. (Ex. 32,32) Chazal tell us, words that come out of the mouths of great people are carried out under all conditions. This, says the Bal HaTurim, was carried out by omitting mentioning Moshe’s name in this week’s Portion.
The Gaon of Vilna asks why Moshe’s name was omitted particularly in this week’s Portion and not in any other. He answers because this Portion is always read in the week when Adar 7 falls out and that is the date that Moshe died.