If there had been immediate gain (in sight), and the journey easy, they would (all) without doubt have followed thee, but the distance was long, (and weighed) on them. They would indeed swear by Allah, "If we only could, we should certainly have come out with you": They would destroy their own souls; for Allah doth know that they are certainly lying. 9:42
Hadith of the day
The most temperate of persons is the one who controls hismself, and in doubtful events is self-contained.
Majlisi, Biharul Anwar, vol.78, p.373 Imam Hassan Al Askari (as)