The Arabic Letter Sad - 38:35 "He said, "My Lord, forgive me. Give me a rule that no one can attain after me. You are the Bestower."
In the context of verses 35, 36...39; what was given by our Lord to the family of David and Solomon:
The Prophets/21:78 And David and Solomon. Once they were judging about someone´s crops where the people´s sheep were scattered. We were witnesses to their judgment.
The Prophets/21:79 And We bestowed upon Solomon the ability to understand rightly, and We gave each of them knowledge and wisdom, and We placed at the command of David the mountains and the birds.
The Prophets/21:80 And We taught him to make armor so that he might protect you in your battles, so will you be grateful?
The Prophets/21:81 And We gave Solomon the command of the gale that blows towards the land which We have made fertile, and We know all things well.
The Prophets/21:82 And the devils who worked for him as divers and did other things besides that. We were watching over them.

The Ants/27:15 "We gave knowledge to David and Solomon and they said: "Praise be to Allah Who has bestowed on us more than many of His servants who believed"."
The Ants/27:16 "Solomon became heir to David. He said, "O people, we have been taught to understand the language of birds and we have been given everything. This is a manifest favor."
The Ants/27:17 For Solomon armies were formed from jinn and men and birds, and they were sent in order.
The Ants/27:18 "When they reached the valley of ants, an ant said, "O ants, enter your nests so that Solomon and his armies may not crush you unawares."
The Ants/27:19 "Laughing at his words, he said, "My Lord, lead me to be grateful for the favors which You have bestowed on me and my parents and to do righteous deeds which You will be pleased with. By Your Mercy, make me one of Your righteous servants."
The Ants/27:20 "And he inspected the birds and said, "Why do I not see the hooting bird, or is it a fugitive?"
The Ants/27:21 If he does not bring me a clear proof (as an excuse), I will punish him severely, or I will slaughter him.
The Ants/27:22 "Soon afterward he came and said, "I have learned something that you do not know,"and he said, "I bring you an important news from Sheba."

Sheva/34:12 And We gave to Solomon the wind, a month´s journey in the morning and a month´s journey in the evening, and We made a spring of oil gush forth for him. By the permission of your Lord, some of the jinn also worked under him. And whoever of them deviated from Our command, We made him taste a severe punishment.
Sheva/34:13 They used to build for Him whatever He willed: Altars, statues, deep pools and heavy cauldrons. O family of David, work as a sign of gratitude. Few of My servants are thankful.
Sheva/34:14 When We decreed his death, it was shown to them that he was dead, but a creature of the earth that ate his staff. When he collapsed, the jinn realized the truth: Had they known the unseen, they would not have continued in that humiliating hard work.

The Arabic Letter Sad/38:18 We placed the mountains at his command; they glorified (God) with him at evening and at dawn.
The Arabic Letter Sad/38:19 The birds also were gathered together; they all followed his command.
The Arabic Letter Sad/38:20 We strengthened his government; We gave him wisdom and good judgment.
The Arabic Letter Sad/38:30 We gave Solomon to David, and he was a good servant, one who always turned (to God).
The Arabic Letter Sad/38:31 One evening, beautiful horses were presented to him.
The Arabic Letter Sad/38:32 "He said, "The love of wealth and property has kept me from the remembrance of my Lord. Until it (the sun) disappeared behind a veil."
The Arabic Letter Sad/38:33 "He said, "Bring them back to me,"and stroked their legs and necks (in farewell)."
The Arabic Letter Sad/38:34 Thus did We test Solomon, and We added material wealth to his kingdom, but he turned wholly (to God).
The Arabic Letter Sad/38:35 "He said, "My Lord, forgive me. Give me a rule that no one can attain after me. You are the Bestower."
The Arabic Letter Sad/38:36 So We gave him the wind at his command, which moved at his command, and he sent down rain wherever he wished.
The Arabic Letter Sad/38:37 And the devils as builders and divers.
The Arabic Letter Sad/38:38 And the reserves who were chained together.
The Arabic Letter Sad/38:39 This is our gift. Whether you give it or keep it, it will not run out.