וַיַּעַשׂ֩ ל֨וֹ אֵה֜וּד חֶ֗רֶב וְלָ֛הּ שְׁנֵ֥י פֵי֖וֹת גֹּ֣מֶד אָרְכָּ֑הּ וַיַּחְגֹּ֤ר אוֹתָהּ֙ מִתַּ֣חַת לְמַדָּ֔יו עַ֖ל יֶ֥רֶךְ יְמִינֽוֹ׃
Ehud fertigte sich an ein Schwert, das zwei Schneiden hatte, eine Spanne lang [einen Dolch], und er gürtete es unterhalb seines Rockes an seiner rechten Hüfte.
Midrash Tanchuma
In the Book of Judges, it is written concerning Ehud: And Ehud made him a sword which had two edges (ibid. 3:16). This indicates that he would have a share in two worlds because he had studied the law, about which it is stated: A two-edged sword in their hand (Ps. 149:6). Hence he was privileged to enjoy the fruits of this world and the hereafter.