תּלמוד אויף שמות 34:3

And if you want to say that [the verse] comes because of the commandment of marital duty, come learn: 'With the sounding of the horn they can go up the mountain' (Exodus 19:13). Since it is written 'Also the flock and the cattle should not feed before that mountain' (Exodus 34:3), why did it [need to say] 'With the sounding of the horn'?

And if you want to say that [the verse] comes because of the commandment of marital duty, come learn: 'With the sounding of the horn they can go up the mountain' (Exodus 19:13). Since it is written 'Also the flock and the cattle should not feed before that mountain' (Exodus 34:3), why did it [need to say] 'With the sounding of the horn'?

Learn from this: Anything which is [prohibited] by a vote [of the Sages] needs another vote to permit it.