John Gill Reformed Baptist @doctorgill

And whoso shall swear by the temple,.... As we have before seen they used to do, and as appears from what the poet says (w): Ecce negas, jurasque mihi per templa tonantis Non credo: jura, verpe, per Anchialum. In which he intimates, that if the Jew swore by the temple, he would not believe him; as well he might not, since such an oath was...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Whose therefore shall swear by the altar, &c.--See on Mat 5:33-37.