Seeing Another’s Pain
A man who is suffering from tzara’as has to call out, “I am tamei.” The simple reason behind this commandment is to warn others not to approach him since he is tamei.
Ahavas Yisrael
Feeling Another’s Pain in the Gemara
The duty to truly feel and pray over another person's suffering, even a small loss, learned from the metzora, the sick tree painted red and Moshe Rabbeinu.