Assalaam Alaikum wa rahmatullah,
Dear brother, I cannot tell if your mother’s words are equivalent to qasam, but I know that watching haram pictures / movies holds no barakah and we will not find hadiths which directly mention these for obvious reasons. What we do know is that each person will have to answer for his/ her actions on the Day of Resurrection and that we will be questioned about many things including how we spent our time. Common sense tells us that watching movies does not benefit us in the least. Yes, it can be viewed as a way of relaxation but as there are many other ways to relax by, it does not present strong enough justification.
Allaah says (interpretation of the meaning):
“Verily, the hearing, and the sight, and the heart of each of those ones will be questioned (by Allaah)” [al-Israa’ 17:36]
And the Prophet (peace and blessings of Allaah be upon him) said:
“The eye commits zinaa (fornication, adultery), and its zinaa is looking.”
(narrated by al-Bukhaari, al-Isti’dhaan, 5774).
Thus, looking at adult scenes which expose awrah of both men and women leads us to deduce that we are doing wrong. In regards to time, Allah Subhana wa ta’ala has given us only a fixed amount of time known as our life span according to His will and what we do with this time is extremely important for us. We will be held accountable for how we spent it. Allah Subhana wa’tala does not want us to spend wastefully of anything.
And Allah Subhana wa taála says:
‘Indeed, the wasteful are brothers of the devils, and ever has Satan been to his Lord ungrateful. ‘ Quran 17:27)
Consider the unnecessary long time frames, high budgets and expenditure, haram scene making, etc that is invested in a typical movie. Imagine how many people are involved in each wasteless project called a movie. Imagine how much money is wastefully paid to the ‘actors’ in these movies. I could go on and on, but it is easy to deduct that watching movies does not hold goodness which draws us closer to Allah Subhana wa ta’ala. And if it does not hold goodness for us then we should distance ourselves from it.
The more you focus on learning about your deen, the more you will find that it is easier to let go of movies. And like any other profound changes which we may experience in our lives, it is a gradual process. InshaAllah, you will achieve your goal of turning away from this.
Anas reported from the Prophet, may Allah bless him and grant him peace, in what he reported from his Lord, the Mighty and Majestic. He said,
"When the slave comes towards Me a hand-span, I go an arm-length towards him. When he comes towards Me an arm-length, I go a fathom towards him. When he comes towards Me walking, I go towards him running." [al-Bukhari]
May Allah Subhana wa ta’ala assist you in achieving your good intentions. Ameen