I believe that the Bible is God's testimony although it came through men. Baha'u'llah wrote that the Bible is God's greatest testimony to His creatures, but did not explain exactly what that means, and we are free to hold our own opinions. Below are some Baha'i positions on the Bible, which I share.
The Bahá'í viewpoint proposed by this essay has been established as follows: The Bible is a reliable source of Divine guidance and salvation, and rightly regarded as a sacred and holy book. However, as a collection of the writings of independent and human authors, it is not necessarily historically accurate. Nor can the words of its writers, although inspired, be strictly defined as 'The Word of God' in the way the original words of Moses and Jesus could have been. Instead there is an area of continuing interest for Bahá'í scholars, possibly involving the creation of new categories for defining authoritative religious literature.
A Baháí View of the Bible
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Below is the Baha'i position on the Bible according to the Guardian of the Baha'i Faith, Shoghi Effendi:
The Bahá'ís believe what is in the Bible to be true in substance. This does not mean that every word recorded in that Book is to be taken literally and treated as the authentic saying of a Prophet.
...The Bahá'ís believe that God's Revelation is under His care and protection and that the essence, or essential elements, of what His Manifestations intended to convey has been recorded and preserved in Their Holy Books. However, as the sayings of the ancient Prophets were written down some time later, we cannot categorically state, as we do in the case of the Writings of Bahá'u'lláh, that the words and phrases attributed to Them are Their exact words
(9 August 1984 to an individual believer)
The Bible: Extracts on the Old and New Testaments
Regarding the stories in the Bible, the following are more letters from Shoghi Efffendi about the Bible:
When 'Abdu'l-Bahá states we believe what is in the Bible, He means in substance. Not that we believe every word of it to be taken literally or that every word is the authentic saying of the Prophet.
(11 February 1944 to an individual believer)
We cannot be sure of the authenticity of any of the phrases in the Old or the New Testament. What we can be sure of is when such references or words are cited or quoted in either the Quran or the Bahá'í writings.
(4 July 1947 to an individual believer)
We have no way of substantiating the stories of the Old Testament other than references to them in our own teachings, so we cannot say exactly what happened at the battle of Jericho.
(25 November 1950 to an individual believer)
Except for what has been explained by Bahá'u'lláh and 'Abdu'l-Bahá, we have no way of knowing what various symbolic allusions in the Bible mean.
(31 January 1955 to an individual believer)
From letters written on behalf of the Universal House of Justice:
The Bible: Extracts on the Old and New Testaments