What is the ruling on a deceased person verbally designating four plots of land to his children without written documentation? And is it obligatory to fulfill the deceased's vow to give a plot of land to someone, and should the land be valued at its current price or its old price?

If the heirs are only the direct sons and daughters of the deceased, and his wives, then the wives' share is one-eighth, divided equally among them. The remainder goes to the direct children by ta'sib (agnatic inheritance), with the male receiving the share of two females. The grandchildren receive nothing because they are excluded by the sons.

A bequest to the children is not valid, as the Prophet (peace be upon him) said: "Indeed, Allah has given every rightful person his due, so there is no bequest for an heir." This is unless the heirs permit it willingly and they are mature and rational.

As for the piece of land that the deceased vowed to a specific person, the heirs must hand it over to him, because the vow is disbursed from the estate before its distribution among the heirs.