Vincent's NT Word Studies
3. Of sticks (fruganwn). Only here in New Testament. From ajpo to roast or parch. Hences dry sticks.Out of (ek). The best texts read ajpo, by reason of.
Robertson's NT Word Studies
28:3 {When Paul had gathered} (sustreyantos tou paulou). Genitive absolute with first aorist active participle of sustrefw, old verb to twist or turn together or roll into a bundle. In N.T. only here and #Mt 17:22. {A bundle of sticks} (fruganwn ti pleqos). "Some multitude (or pile) of dry twigs" (fruganwn from frugw or frussw, to dry. Only here in N.T.). {Laid} (epiqentos). So genitive absolute again with second aorist active participle of epitiqemi, to place upon. Few things show Paul to better advantage than this incident. {By reason of the heat} (apo tes qermes). Old word, only here in N.T. Ablative case with apo (from the heat). The viper was in a state of torpor in the bundle of sticks. The heat wakened him. {A viper} (ecidna). The old word used by the Baptist of the Pharisees (#Mt 3:7; Lu 3:7) and by Jesus also (#Mt 12:34; 23:33). It is objected that there is little wood in the island today and no vipers, though Lewin as late as 1853 believes that he saw a viper near St. Paul's Bay. But the island now has 1,200 people to the square mile and snakes of any kind have a poor chance. The viper has also disappeared from Arran as the island became more frequented (Knowling). Ramsay thinks that the small constrictor (_Coronella Austriaca_) which still exists in the island may be the "viper," though it has no poison fangs, but clings and bites. The natives thought that it was a poisonous viper. {Fastened on his hand} (kaqeye tes ceiros autou). First aorist active indicative of kaqaptw, to fasten down on with the genitive case. Old verb, here only in N.T. Cf. #Mr 16:18.