Fath al-Rabbani

Benefits: … The Arabs used to take omens from the name, sound, and passing of a bird.
The meanings of "jibt" include soothsayer, devil, and everything that is worshipped besides Allah Ta'ala.
In the era of ignorance (Jahiliyyah), it was common to take good or bad omens through certain means. For example, a person intending to travel would make a bird fly; if it flew to the right, he would consider it a sign of a blessed journey and would set out, but if the bird flew to the left, he would consider it a sign of an ill-fated journey and would abandon his intention. Many other signs were also established. All these matters are forbidden and haram. The mere coincidence of something turning out to be correct does not justify all these superstitions. These things have no effect in bringing benefit or repelling harm. All of this is conjecture and guesswork, and to rely or depend on such things is ignorance, misguidance, and superstition.

However, the Shari'ah has permitted taking a good omen upon hearing a good word, on the basis of which a person develops good expectations from Allah Ta'ala, which is a commendable matter. As Sayyiduna Anas radi Allahu anhu narrates that the Messenger of Allah sallallahu alayhi wa sallam said: "There is no contagion and no bad omen, but I like a good omen (fa’l)." The Companions asked: "What is a good omen?" He sallallahu alayhi wa sallam replied: "A good word (kalimah tayyibah)." That is, hearing a good word and attaching hope of good to it. (Bukhari, Muslim)

In another narration, he sallallahu alayhi wa sallam called a good omen "al-kalimah al-hasanah" (a good word), upon which Imam Kirmani rahimahullah wrote: From this it is known that Allah Ta'ala has placed the love of good omens in human nature, just as one feels comfort upon seeing a pleasing sight or clear water, even if that water is not used. (Awn al-Ma‘bud)

For example, if a person intends to undertake a lawful business or journey, and all his friends, especially pious elders, praise his initiative, pray for his well-being, and encourage him, or all the means required for that work become easily available. From all these matters, he concludes that it seems his action is pleasing to Allah Ta'ala, and as a result, he develops good expectations from Allah Ta'ala. This is called taking a good omen. Nevertheless, in the future, there remains the possibility of any kind of trial from Allah Ta'ala. It is thus clear that a good omen is merely another name for good expectations, not a guarantee that future dangers will be averted.

It is the practice of a Muslim to take good omens, not bad ones. Therefore, when a Muslim resolves to do a lawful act, no bad omen prevents him from it, because he firmly believes that in matters of benefit and harm, the only true effective cause is Allah Ta'ala. In reality, by declaring the taking of good omens as commendable, there is also an implicit encouragement that every Muslim should say good things about other Muslims and their lawful actions, and should hear good things, so that people may derive good omens from them. One should avoid saying things that cause people to feel aversion or create fear of bad omens in their hearts.

It has become clear that a Muslim, when faced with bad omens or ill omens, does not consider his resolve to be unlucky, but rather, entrusting future matters and benefit or harm to Allah Ta'ala, he proceeds to fulfill his intention in practice. It should be kept in mind that sometimes outdated thoughts based on bad omens can surround a person, but he should, trusting in Allah Ta'ala, cast them out of his heart and mind, as the Messenger of Allah sallallahu alayhi wa sallam said: "That is something they find in their hearts, but it should not prevent them (from their actions or plans)." (Sahih Muslim)

It is narrated from Abu Hurayrah radi Allahu anhu that the Messenger of Allah sallallahu alayhi wa sallam heard a word that pleased him greatly, so he sallallahu alayhi wa sallam said: "We have taken your good omen from your mouth." (Sahihah: 726)
That is: "We have considered your good omen to be valid."

It is not clarified what matter this was about, but Sayyiduna Anas radi Allahu anhu narrates: "Indeed, the Prophet sallallahu alayhi wa sallam used to like, when he went out for a need, to hear someone say: 'O one who is rightly guided! O one who will succeed in his need!'" (Tirmidhi)
That is, the Prophet sallallahu alayhi wa sallam wished that someone would praise his effort and give him glad tidings of the fulfillment of his need.