“They will no more teach each one his companion and each one his brother, saying, ‘Know Jehovah!’ for they will all of them know me, from the least one of them even to the greatest one of them.”​—Jeremiah 31:34.

10. (a) So under what designation did the remnant of spiritual Israelites begin to welcome the “other sheep”? (b) What knowledge did the “other sheep” acquire?

¹⁰ In 1935 the remnant of spiritual Israelites began welcoming the “other sheep” of the Fine Shepherd into active association with them in “one flock” under Jesus Christ, all of them being Jehovah’s Witnesses. Then those “other sheep,” who began building up to be “a great crowd” without any foreordained number, undertook, along with the spirit-begotten remnant, to “observe the commandments of God” and to do “the work of bearing witness to Jesus.” (Revelation 7:9-17; 12:17) Thus from the start in 1935, these “other sheep” also got to know Jehovah “from the least one of them even to the greatest one of them.”

11. How is Christian knowledge of Jehovah different from and better than that of the Jews under the Law covenant?

¹¹ In what way, however, is Christian knowledge of Jehovah different from and better than the knowledge that the Jews had under the old Mosaic Law covenant? The heavenly Maker of the new covenant goes on to tell us: “For I shall forgive their error, and their sin I shall remember no more.” (Jeremiah 31:34; Hebrews 8:12) This is due to the fact that the new covenant is based upon a better sacrifice by means of a better Mediator. (Hebrews 8:6; 9:11, 12, 22, 23) The better sacrifice of the better Mediator needs no repeating, as on the annual Day of Atonement under the old Mosaic Law covenant. (Hebrews 10:15-18) In view of all of this, the knowledge of Jehovah possessed by those in and under the new covenant is indeed better, more enriching, more discerning, more complete than the knowledge of God that the Jews had under the Law covenant.

14. What good preparation will the surviving “great crowd” have had?

¹⁴ The surviving “great crowd” of “other sheep” will have had good preparation for taking up life in the new system of things. Like the remnant of spiritual Israelites, they will have come to know God “from the least one of them even to the greatest one of them.” (Jeremiah 31:34) In prayer to God, the reigning King once said: “This means everlasting life, their taking in knowledge of you, the only true God, and of the one whom you sent forth, Jesus Christ.” (John 17:3) So this universal knowledge of Jehovah God will work out for everlasting salvation. This will be true not only for the “flesh” that will be saved alive out of the “great tribulation” but also for the billions of human dead ones who will hear the voice of the King and come forth from their memorial tombs. All needed knowledge of Jehovah will be imparted to such resurrected ones.​—Matthew 24:21, 22; John 5:28, 29; Revelation 20:11-15.