Charles H. Spurgeon on Psalms 125:3

Lest the righteous put forth their hands, etc. The trial is to prove faith, not to endanger it by too sharp a pressure: lest, overcome by this, even the faithful put forth a hand (as in Ge 3:22), to forbidden pleasure; or (as in Ex 22:8), to contamination: through force of custom gradually persuading to sinful compliance, or through despair of good, as the Psalmist (see Ps 37:1-40 and Ps 73:1-28) describes some in his day who witnessed the prosperity of wicked men. —The Speaker's Commentary, 1871-1881.