והייתם נקיים מה' ומישראל

The Chasam Sofer (Shu"t 6 : 59) writes. "There are two obligations 

1) be vindicated from Hashem

2) be vindicated 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 accuses him of wrongdoing, such a person has not  

fulfilled his obligation of והייתם נקיים(מישראל)  .

It is almost impossible to fulfill this obligation. It is very likely

Shlomo Hamelech had this in mind when he

wrote אין צדיק בארץ

We find  the Bnei Gad etc. followed

Moishe Rabbeinu's advice and fought along

with the other Shevatim for 14 years. They were punished 

to be sent to Galus before the rest of Klall

Yisroel, because they haven't fulfilled 100% the obligation

of והייתם נקיים ."

*Interesting opinion the Chasam Sofer held on beer drinkers