Quran

The wisdom in comparing faith to a tree is that a tree has to have three things to be a tree: A firm root, a standing trunk and high branches; similarly, faith is not complete without these three things: Acceptance by the heart, statement by the tongue, and action by deeds. Al-Baghawi: 2/556.
Question: What is the wisdom in comparing the servant's faith to a tree?

Allah will make them steadfast in the life of this world, when they are faced with specious arguments and doubts, He guides them to certainty; when they are tempted by desires, He bestows upon them strong resolve whereby they will give precedence to that which Allah loves over their own whims and desires. Al-Saadi: 425.
Question: Give some examples of how Allah makes His servant steadfast in worldly life.

Allah will make them steadfast at the end of life, at the moment of death, He will make them steadfast in their Islamic religion and give them a good end; in the grave, when they are questioned by the two angels, He will guide them to the correct answer. Al-Saadi: 426.
Question: Give some examples of how Allah makes His servant steadfast at the end of life and beyond.

In recompense for their disbelief in this worldly life, Allah does not guide the disbelievers to the right answer when they are questioned in their graves by the two angels. When they are asked, they would say: "we do not know,", the angels reply: "you neither knew nor recited [the Quran]", so then he is hit with maces. Al-Qurtubi: 12/140.
Question: How are the wrongdoers sent astray after their death?

Whoever searches into the affairs of this world, will conclude that Allah did not bestow a greater blessing upon people of the earth than sending them His Messengers, but the ones rejected His message are those of whom Allah says: (Did you not see those who exchanged Allah's blessings with disbelief, and led their people to the abode of ruin). Ibn Taimyah: 4/116-117.
Question: Allah did not bestow a greater favor upon His creation than sending them the Message of Muhammad (ﷺ). How?

(Say, "Enjoy yourselves"): This is a threat to them, which belittles their pleasures in this worldly life since they are brief. Al-Qurtubi: 12/142.
Question: The adornment of this worldly life is called passing enjoyment. Why?

Establishing prayer means performing it on time, fulfilling its conditions while maintaining humility throughout its acts of bowing and prostrations. Ibn Kathir: 2/519.
Question: What is meant by establishing prayer in this verse?