Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The heel in a dream is a man's offspring in his wealth and son. Pain in it indicates worry from the son.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The heel indicates steadfastness in religion. Whoever sees his heel is strong is steadfast in his religion.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The heel is interpreted as wealth. Whoever sees his heel break, his wealth is gone.