Looking diligently,.... Acting the part of bishops, or overseers, as the word signifies; and so this exhortation either respects officers of the church of the Hebrews, whose business it was more especially to inspect into the principles and practices of the members of it, and take care that they did not imbibe false doctrines, or live immoral lives; or rather the several members of the church, whose business it is to watch over one another, since this epistle seems to be written to the whole church.
Lest any man fail of the grace of God; not the free favour and love of God in Christ, which is everlasting, unchangeable, and from whence there is no separation; nor the grace of God implanted in the heart in regeneration, which is incorruptible, never failing, but always remains, as do faith, hope, and love; but either the whole doctrine of the Gospel, which is a declaration of the grace of God; or particularly the doctrine of free justification by the righteousness of Christ, which men may receive in vain, and fall from, 2Co 6:1 to which these Hebrews might be prone: and such "fail" of it, who either come short of it, do not come up to it, receive and embrace it; or who having professed it, drop it and deny it: now such should be looked after, and such a case should be diligently looked into; because the glory of God, the honour of Christ, the good of souls, and the well being, and even the continuance of the church state are concerned:lest any root of bitterness springing up trouble you, [and] thereby many be defiled; the Alexandrian copy reads oi polloi, "the many", the common people, the private members of the church; though it may intend either things or persons: it may design things; and these either the corruption of nature in general, which is a root that lies hidden in a man's heart; and is a root or gall of bitterness; and is apt to spring up, and bring forth bitter fruit, and gives trouble both to a man's self and others; and is of a defiling nature, in particular sins; such as malice, strife, and contention, covetousness, lust, pride, oppression, idleness, &c.
which make bitter work, and occasion great trouble in churches, oftentimes: or errors and heresies, which sometimes, like roots, lie under ground, secret and undiscovered; and are bitter ones in their effects, bringing ruin and swift destruction on the souls of men; and these sometimes spring up in churches, while ministers and members are asleep, or not so diligent and watchful as they should be; and occasion great trouble, and are very infectious, and defiling: moreover, persons may be designed; which agrees well with De 29:18 from whence this phrase is taken; and with the instance in the following verse, such as all immoral persons, and false teachers, particularly self-justiciaries, that preach the doctrine of justification by the works of the law: this was the capital mistake, and rooted error of the Jewish nation; and a bitter one it was; it produced many bitter fruits of pride and vain glory; and this sprung up in the church, and troubled and defiled many there and elsewhere, being spread by the abettors of it; see Ac 15:24.
Now, care should be taken, that no such person be in churches, holding such an error; because of the glory of God, Father, Son, and Spirit; the comfort of souls; the peace of the church, and the growth and increase of it, which must be hurt by such men and doctrines; soriza amartwlov, "a sinful root", is used for a "wicked man", in the Apocrypha:"In those days went there out of Israel wicked men, who persuaded many, saying, Let us go and make a covenant with the heathen that are round about us: for since we departed from them we have had much sorrow.'
' (1 Maccabees 1:11)and yrmh vrwv, "a root of bitterness", signifies, in Jewish writings , an error, or heresy, in opposition to a root of faith, or a fundamental doctrine. Cosri, Orat. 1. fol. 35.