Strain at

Simply a misprint for "strain out" (Matt. 23:24)

To strain at (rather, out) a gnat and swallow a camel was also a proverbial expression (Matt. 23:24), used with reference to those who were careful to avoid small faults, and yet did not hesitate to commit the greatest sins. The Jews carefully filtered their wine before drinking it, for fear of swallowing along with it some insect forbidden in the law as unclean, and yet they omitted openly the "weightier matters" of the law.