Here the Gemara very graciously appends a direction as to the disposal of the purse, in case the traveler should happen to be on foot and have no Gentile attendant. He may take care of it himself, provided he halt at every other step and deposit it on the ground, for at least a distance of four cubits. A master is bound to rehearse a lesson to his pupil four times. _Eiruvin_, fol. 54, col. 2. Alas for the power which prepares a grave for its possessor, for there is not a prophet who hath not in his lifetime witnessed the decadence of four kings; as it is said (Isa. i. 1), "The vision of Isaiah ... in the days of Uzziah, Jotham, Ahaz, and Hezekiah, kings of Judah" (see also Hosea i. 1). _P'sachim_, fol. 87, col. 2. Once Rav Pappa and Rav Hunnah partook together of a common meal, and as the latter ate only one morsel the former ate four. After this, when Rav Hunnah and Ravina ate together, the latter devoured eight portions to the other's one, upon which Rav Hunnah jocularly remarked, "A hundred (Rav) Pappas to one Ravina." _P'sachim_, fol. 89, col. 2. No food may be eaten on Passover-eve from the time of the offering of the evening sacrifice (in order, i.e. that abstinence may whet the appetite for the Matsoth). Even the poorest in Israel may not break his fast till the hour of reclining; nor is he to partake of less than four glasses of wine, even though he has been reduced so low as to subsist on the porridge doled out by public charity. Ibid., fol. 99, col. 2. There are four things the doing of which by man brings judgment upon his own head:--If he turn in between a wall and a date-palm; if he turn in between two date-palms; if he drink borrowed water; and if he step across spilt water, such even as his own wife may have thrown away. (All these doings, says Rashi, are bound to annoy the evil genii.) Ibid., fol. 111, col. 1. Four precepts did our holy Rabbi (Yehudah Hakadosh) urge upon his children:--Not to choose Shechentzia as a dwelling-place, for scoffers resided there; not to use the bed of a Syrian odalisque; not to shirk the payment of fiscal dues, lest the collector should confiscate all their property; not to face an ox when he came up (ruffled) from the cane-brake, for Satan sported betwixt his horns. _P'sachim_, fol. 112, col. 2. Whosoever prieth into the four things in the matter of the chariot in Ezekiel's vision--what is above, what is beneath, what is before, or what is behind--it were better for him if he had never been born. _Chaggigah_, fol. 11, col. 2. The work or matter of the chariot, the Rabbinic term for the Vision of Ezekiel, ranks among the Arcana Judaica, which are not to be told save to the initiated.