Притчи 25:13

The following comparative tristich refers to faithful service rendered by words: Like the coolness of snow on a harvest day Is a faithful messenger to them that send him: He refresheth the soul of his master. The coolness (צנּה from צנן, צנן, to be cool) of snow is not that of a fall of snow, which in the time of harvest would be a calamity, but of drink cooled with snow, which was brought from Lebanon or elsewhere, from the clefts of the rocks; the peasants of Damascus store up the winter's snow in a cleft of the mountains, and convey it in the warm months to Damascus and the coast towns. Such a refreshment is a faithful messenger (vid., regarding ציר, Pro 13:17, here following קציר as a kind of echo) to them that send him (vid., regarding this plur. at Pro 10:26, cf. Pro 22:21); he refreshes, namely (ו explicativum, as e.g., Eze 18:19, etenim filius, like the ו et quidem, Mal 1:11, different from the ו of conditional clause Pro 23:3), the soul of his master; for the answer which he brings to his master refreshes him, as does a drink of snow-cooled water on a hot harvest day.

See here, 1. What ought to be the care of a servant, the meanest that is sent on an errand and entrusted with any business, much more the greatest, the agent and ambassador of a prince; he ought to be faithful to him that sends him, and to see to it that he do not, by mistake or with design, falsify his trust, and that he be in nothing that lies in his power wanting to his master's interest. Those that act as factors, by commission, ought to act as carefully as for themselves. 2. How much this will be the satisfaction of the master; it will refresh his soul as much as ever the cold of snow (which is hot countries they preserve by art all the year round) refreshed the labourers in the harvest, that bore the burden and heat of the day. The more important the affair was, and the more fear of its miscarrying, the more acceptable is the messenger, if he have managed it successfully and well. A faithful minister, Christ's messenger, should be thus acceptable to us (Job 33:23); however, he will be a sweet savour to God, Co2 2:15.

25:13 Snow would be a welcome relief in Israel’s hot, dry summers (cp. 26:1); trustworthy messengers refresh their employer by enabling him or her to plan for the future.