The most difficult command in the Torah

 

Parshas Hashavua מטות מסעי                                       והייתם נקיים מה' ומישראל According to the Chasam Sofer, the most difficult command in the Torah is, "והייתם נקיים - מישראל".  It's next to impossible to fulfill this command. The Chasam Sofer (Shut 6 : 59) writes. "There are two obligations  1) To come clean from Hashem 2) from Bnei Yisroel.  It is much easier to fulfill the first obligation than the second one. The punishment on the second obligation is also much greater. (Chillul Hashem). You can have a person doing something which is Halachicly  correct, but isn't careful  and some "שותי שכר" (beer drinkers) mistakenly accuse him of wrongdoing, such a person has not   fulfilled his obligation of והייתם נקייםמישראל. It is almost impossible to fulfill this obligation. It is very likely שלמה המלך had this in mind when he wrote אין צדיק בארץ We find  the Bnei גד etc. followed Moishe Rabbeinu's advice and fought along with the other שבטים for 14 years. They were punished  to be sent to גלות before the rest of כלל ישראל, because they haven't fulfilled 100% the obligation of והייתם נקיים ."