perek yud pusuk aleph and bet- Nadav and Abihu sinned and were killed by hashem.
וַיִּקְח֣וּ בְנֵי־אַֽ֠הֲרֹ֠ן נָדָ֨ב וַֽאֲבִיה֜וּא אִ֣ישׁ מַחְתָּת֗וֹ וַיִּתְּנ֤וּ בָהֵן֙ אֵ֔שׁ וַיָּשִׂ֥ימוּ עָלֶ֖יהָ קְטֹ֑רֶת וַיַּקְרִ֜יבוּ לִפְנֵ֤י יְהֹוָה֙ אֵ֣שׁ זָרָ֔ה אֲשֶׁ֧ר לֹ֦א צִוָּ֖ה אֹתָֽם:
And Aaron's sons, Nadab and Abihu, each took his pan, put fire in them, and placed incense upon it, and they brought before the Lord foreign fire, which He had not commanded them.
וַתֵּ֥צֵא אֵ֛שׁ מִלִּפְנֵ֥י יְהֹוָ֖ה וַתֹּ֣אכַל אוֹתָ֑ם וַיָּמֻ֖תוּ לִפְנֵ֥י יְהֹוָֽה:
And fire went forth from before the Lord and consumed them, and they died before the Lord.
what was their sin?
Rashi says that Rabbi Yishmaeal says that they were drunk when they went into the mikdash.
Q: What are other reasons to what their sin was? What did they do wrong?