BASI L’GANI 5713
Being that shtus d’l’umas zeh and sins cause the Divine presence to depart, in order to bring about a change of course, so that “I shall dwell among you” [as before the sin], there must be “make for Me a Mikdash (specifically) of Acacia Trees, atzei Shittim” – shtus d’k’dusha is required.