Shlach - Thought Precedes Action

If because of the eyes of the congregation it was committed inadvertently, the entire congregation shall prepare a young bull as a burnt offering for a pleasing fragrance for the L-rd with its prescribed meal offering and libation, and one young he goat for a sin offering.

וְהָיָה אִם מֵעֵינֵי הָעֵדָה נֶעֶשְׂתָה לִשְׁגָגָה וְעָשׂוּ כָל הָעֵדָה פַּר בֶּן בָּקָר אֶחָד לְעֹלָה לְרֵיחַ נִיחֹחַ לה' ומִנְחָתוֹ וְנִסְכּוֹ כַּמִּשְׁפָּט וּשְׂעִיר עִזִּים אֶחָד לְחַטָּת

Bamidbar 15:24

Why is the sin offering (חַטָּת)  spelled without an Aleph?

Rashi:
for a sin-offering: Heb. לְחַטָּת [This word] is missing an ‘aleph,’ because this [sin-offering] is different from all other sin-offerings. In the case of all the other sin-offerings [mentioned] in the Torah which are brought together with a burnt offering, the sin-offering precedes the burnt offering, as it says, “he shall make the second one a burnt offering” (Lev. 5:10), but this one-the burnt offering-precedes the sin-offering. - [Hor. 13a]

The Kli Yakar explains the sin offering referred to is about the sin of Avoda Zara, which is really being denial of the entire Torah. Every sin is bound by thought and action, for all action precedes thought, for if one faults without intention this is not sin rather Force majeure.  Thus every sinner must bring 2 offerings - Oleh for the thoughts and Hatat for the action. Even though the thoughts generally lead to the action, in any case action is worse than thought for HaKodesh Baruch Hu doesn't punish for mere thoughts.

In every case, the action is the main aspect to the sin, that is why the Hatat is brought first to remove the major part of the sin and then the Olah. Except in the case of Avoda Zara, since the thought in the sin of Avoda Zara, that is the essence of the sin since this is dependent upon one's intimate beliefs. Thus Olah precedes Hatat here to remove the greater sin first.

Now we can understand why the Hatat is missing the Aleph. For Aleph is the first letter and comes to represent the intimate connection of Hashem with living creations. The sinner that commits Avoda Zara denies this connection. Thus the Aleph is missing showing that we are talking about Avoda Zara.