וַיִּשְׁלַ֤ח אֵהוּד֙ אֶת־יַ֣ד שְׂמֹאל֔וֹ וַיִּקַּח֙ אֶת־הַחֶ֔רֶב מֵעַ֖ל יֶ֣רֶךְ יְמִינ֑וֹ וַיִּתְקָעֶ֖הָ בְּבִטְנֽוֹ׃
And Ehud put forth his left hand, and took the sword from his right thigh, and thrust it into his belly.
Read kabbalistic (mystical) interpretation of Judges 3:21: and classical mystical sources.