Musar do Psalmów 41:2

And further: Another poor man came before Rabbi Yitzchak carrying a half ma’ah coin in his hand. He said to Rabbi Yitzchak, “Make my soul and those of my sons and daughters whole.” Rabbi Yitzchak replied, “How can I make your souls whole when I have only a half ma’ah coin on me?” The poor man answered, “I will complete your coin with the half ma’ah coin that I already have.” So Rabbi Yitzchak took out his coin out and gave it to him. Then Rabbi Yitzchak was shown a dream in which he was walking along the shore of the ocean and someone was trying to throw him in. He reached for the outstretched hand of Rabbi Shimon ben Yochai but just then the poor man came along and saved him. When he awoke, this is the verse that came into his mouth, “Fortunate is the one who understands [the needs of] the lowly, on a day of evil Hashem will preserve him” (Tehillim 41:2).