Here we have to refer to scientific facts, what is the forelock? Why is it described as lying and sinning?

Many scholars kept thinking about it, and returned to the books of interpretation, then concluded that: The forelock is the front of the head, called lying, while what is meant is that its owner is a liar, so that, it is allegorical meaning, not real.

But at a scientific medical conference in the current era, about fifty years ago, it was confirmed that the part of the brain just below the front (the forelock) is responsible for lying and wrongdoings, and it is the source of making decisions. If this area of the brain that is located just below the bone is cut, then its owner will not have an independent will, and he cannot choose, because it is the place of choice. Glory be to Allah (swt) Who says: “We will surely drag him by the forelock”.

However, after the science developed a lot, it has been found that this part in the animal’s forelock is weak and small. It does not have the ability to lead and direct. Allah (swt) says:

{ مَا مِنْ دَابَّةٍ إِلا هُوَ آخِذٌ بِنَاصِيَتِهَا }
(There is no creature but that He holds its forelock.) (Hud: 56)

It is narrated in the Noble Hadith:

“O Allah, I am Your slave, son of Your slave, son of Your female slave, my forelock is in Your hand,”[1]

There is a divine wisdom that Allah (swt) has ordained this forelock to prostrate, by this, negative charges come out from the head to the earth and the blood reaches the parts of the brain. This is not done except by prostration:

{ وَمَا أُوتِيتُمْ مِنَ الْعِلْمِ إِلَّا قَلِيلاً }

(And mankind have not been given of knowledge except a little.)

(Al-Israa: 85)

A lot of prostration leads to right decisions of which the rightest one is to worship Allah (swt). The Prophet (saw) requested that we make Istikharah prayer in which we prostrate with our forelock to Allah (swt) to lead us to sound opinion.

[1] Musnad al-Imam Ahmad, Hadith No. 4318.