[4:135]
"O you who believe, be upright in justice; witnesses for God, even though it be against yourselves; or parents and kinsmen, whether the person be rich or poor; God is closer to the two. So do not follow any whim, lest you swerve, for if you twist, or refrain, surely God is ever aware of what you do. "
[4:136]
"O you who believe, believe in God and His Messenger and the Book which has been revealed to His Messenger; and the Book which was revealed before. And whoever disbelieves in God and His angels and His Books, and His messengers, and the Last Day, verily he has strayed far away."
Commentary:
[4:135]
O you who believe, be upright in justice; witnesses, of the truth, for God, even though it, the witnessing, be against yourselves, so be witness against them [your selves] by affirming the truth and not concealing it; or, against, parents and kinsmen, whether the person, witnessed against, be rich or poor; God is closer to the two, than you and He has better knowledge of what is good for them. So do not follow any whim, in your testimonies by being partial to the rich one, seeking his pleasure, or [by being partial] to the poor one out of compassion for him, lest you swerve, so that you do not incline away from the truth, for if you twist (a variant reading [for talwūw] has talū) [if] you distort your testimony, or refrain, from giving it, surely God is ever aware of what you do, and will requite you accordingly.
Source: Commentary of al-Jalalayn
(O ye who believe! Be ye staunch in justice, witnesses for Allah, even though it be against yourselves or (your) parents or (your) kindred, whether (the case be of) rich or poor) parents, (for Allah is nearer unto both (than ye are)) Allah has better right to protect them than you do. (So follow not passion lest ye lapse) lest you are not just in testimony (and if you lapse) if you stammer (or fall away) or do not testify in front of judges, (then lo! Allah is ever Informed of what ye do) whether you testify or withhold your testimony. This verse was revealed regarding Miqyas Ibn Sababah who had something to testify against his father.
Source: Tanwîr al-Miqbâs min Commentary of Ibn ‘Abbâs
[4:136]
These are the tenets of faith. What constitutes Iman.