Suicide bomber Salman Abedi sent £470 to his family in Libya just hours before he committed mass murder at Manchester Arena.
The public inquiry into the atrocity also heard on Tuesday that his brother, Hashem Abedi, asked a friend to buy sulphuric acid for him two months earlier.
The bomb attack after an Ariana Grande concert on May 22, 2017, claimed 22 lives and left more than 1,000 injured.
Hashem Abedi was convicted of 22 counts of murder, one count of attempted murder and one count of conspiracy to cause an explosion following a trial in March.
He was jailed in August for a minimum of 55 years.
Rabie Zreba, the inquiry heard, was called out of the blue by Salman Abedi at 5.11pm on the night of the bombing.
Abedi asked him to send money he would give him to Libya.
Mr Zreba said he didn't know who Salman Abedi was, and others had given him his mobile phone number.
They met, the inquiry was told, at the Muslim Youth Foundation in Manchester.
Giving evidence, Mr Zreba said he took the money and details of the 'receiver' - the person who the money was sent to - before they 'went in our own directions'.
Abedi, he said, gave him a false name.
Mr Zreba said he didn't notice any nervousness on Abedi's part and they discussed only the transaction, which barrister Austin Welch, representing the families of three of the victims, suggested was 'a form of hawala banking' based around trust.
"He was as normal. I didn't notice anything not normal," Mr Zreba said.
By 6.53pm, the inquiry heard the money had been transferred in Libya.
Mr Zreba was at Manchester Victoria railway station after the bomb detonated, the inquiry was told.
He said he missed a train he wanted to catch home from Oxford Road station and walked to Victoria to catch another one.
Mr Welch asked him: "Did he [Abedi] mention anything to you about 'don't go near Victoria' during the course of the conversation with him?"
Mr Zreba replied 'no' - and said he would have reported anything Abedi told him 'to save the lives of the victims'.
Earlier, a former friend of Hasham Abedi said the bomber's brother was taking 'a lot' of drugs in 2017.
In the March before the atrocity, he told how Abedi asked him to buy acid for him.
Giving evidence, the witness, who cannot be named for legal reasons, said: "He said to me that his brother tipped the generator, the electricity generator and it's not working and he needed acid for it."
The witness said Hashem told him the generator was in Libya and sent him an 'Amazon link' to buy acid.
But he said he had no funds in his bank account to make any purchase - and a relative told him not to get involved.
"My reaction was, obviously, I don't want to do it," he said.
"I don't want to get involved. I listened [to the relative].
"I thought the better option was at that time to ignore him.
"I didn't think it [the Arena attack] was going to happen.
"It was not something he [Hashem Abedi] would do.
"Obviously I'm wrong, but...the last thing I thought is this guy was going to do that, you know?"
The public inquiry into the atrocity is due to last until spring.
