Matthew Poole and continuators on Exodus 19:15

15 And he said unto the people, Be ready against the third day, come not at your wives .

Abstain from the use of the marriage-bed; partly because your wives may haply have their uncleanness upon them though unknown to themselves at lest to you, whereby you may be legally defiled; See Lev. 15. 18. and partly that your minds may be abstracted from all sensual delights and wholely employed about this great and holy work and service. There is a like command 1 Cor. 7. 5. but both this and that do indifferently concern both ministers and people and are limited to a certain time, and therefore are very impertinently alledged for the perpetual celibacy of Ministers. See also 1 Sam. 21. 5.

Marginal references: 1 Sam. 21. 4, 5. Zech. 7. 3. 1 Cor. 7. 5.