Hebrews 3:12

“Take heed, brethren, etc..] This exhortation is grounded upon the state and case of their ancestors before given, as a warning and caution to the then present Hebrews; and whom the apostle styles “brethren”, to show that he had no hard thoughts of them, and that his jealousy was a godly one, and not an evil suspicion; and may teach us that all exhortations, admonitions, and reproofs should be given in love: lest there be in any of you an evil heart of unbelief; or such an evil heart, in which unbelief prevails, and is predominant: there is in every man, whether a profane sinner, or an hypocritical professor, an evil heart, and an unbelieving one; and there is unbelief in regenerate persons,…”

“Take heed--to be joined with "wherefore," Heb 3:7. lest there be--Greek (indicative), "lest there shall be"; lest there be, as I fear there is; implying that it is not merely a possible contingency, but that there is ground for thinking it will be so. in any--"in any one of you." Not merely ought all in general be on their guard, but they ought to be so concerned for the safety of each one member, as not to suffer any one to perish through their negligence [CALVIN]. heart--The heart is not to be trusted. Compare Heb 3:10, "They do always err in their heart." unbelief--faithlessness. Christ is faithful; therefore, saith Paul to the Hebrews, we ought not to be faithless as our fathers were…”

“Take heed, brethren - In view of the conduct of the rebellious Jews, and of their fearful doom, be on your guard lest you also be found to have had the same feelings of rebellion and unbelief. See to it, that under the new dispensation, and in the enjoyment of the privileges of the gospel, you be not found to manifest such feelings as shall exclude you from the heavenly world. The “principle” has been settled by their unbelief that they who oppose God will be excluded from his rest. That may be shown under all dispensations, and in all circumstances, and there is not less danger of it under the gospel than there was when the fathers were conducted to the promised land. You are traveling…”

“Take heed, lest there be in any of you - As there was in them. An evil heart of unbelief - Unbelief is the parent of all evil, and the very essence of unbelief lies in departing from God, as the living God - The fountain of all our life, holiness, happiness. Hebrews 3:13”

“3:12-19 The author of Hebrews discusses the terms heart, day, today, hear, enter, rest, unbelief, and oath, all drawn from Ps 95. Bible teachers of the ancient world would cite and then explain an Old Testament text, often highlighting significant words from the text, just as preachers do today. This form of exposition was called midrash. 3:12 hearts . . . not evil and unbelieving: An evil heart stubbornly sets its will against the Lord due to unbelief, causing a person to turn away from the living God.”

“Take: Heb 2:1-3, Heb 12:15; Mat 24:4; Mar 13:9, Mar 13:23, Mar 13:33; Luk 21:8; Rom 11:21; Co1 10:12 an: Heb 3:10; Gen 8:21; Jer 2:13, Jer 3:17, Jer 7:24, Jer 11:8, Jer 16:12, Jer 17:9, Jer 18:12; Mar 7:21-23 in: Heb 10:38, Heb 12:25; Job 21:14, Job 22:17; Psa 18:21; Pro 1:32; Isa 59:13; Jer 17:5; Hos 1:2 the: Th1 1:9 Hebrews 3:13”