Neither let us tempt the Lord (mēde ekpeirazōmen ton Kurion). So the best MSS. instead of Christ. This compound occurs in lxx and in N.T. always about Christ (here and Mat 4:7; Luk 4:12; Luk 10:25). Let us cease sorely (ek̇) tempting the Lord by such conduct.
And perished by the serpents (kai hupo tōn opheōn apōllunto). Vivid imperfect middle (cf. aorist middle apōlonto in 1Co 10:10), were perishing day by day. The story is told in Num 21:6. The use of hupo for agent with the intransitive middle of apollumi is regular. Note the Ionic uncontracted genitive plural opheōn rather than ophōn.