The bank offered to freeze part of his account in return for interest

Firstly: 

Before we give advice to your
husband with regard to riba, we think that it is essential for us to offer
him advice on something that is more important, which is the ‘Alawi madhhab.
The ‘Alawi madhhab has many beliefs that are contrary to the beliefs of the
Muslims. Hence we hope that your husband will examine those beliefs and
reject those that are contrary to Islam, and believe that which is indicated
by the Book of Allaah and the Sunnah of His Messenger (blessings and peace
of Allaah be upon him). In the answer to question number 109264 we have
given a brief description of the ‘Alawi sect; please refer to it. 

Secondly: 

Freezing the bank account in
return for getting 40,000 dirhams is the essence of riba, because in fact
this transaction is a loan with interest. It makes no difference whether the
bank is in need or not. Every loan that brings benefit is riba according to
scholarly consensus. What a loan means is taking money and paying it back;
if there is an agreement that it will be returned with something extra, even
if it is one dirham, this is undoubtedly riba. 

There is nothing in the
Qur’aan or Sunnah to suggest that riba is only that which is taken from the
needy, sick or desperate. Rather there are many types of riba, including
loans with interest. There is also the riba of sales, such as exchanging
gold for gold with an additional amount, or silver for silver with an
additional amount, or date or dates with an additional amount. The Prophet
(blessings and peace of Allaah be upon him) said: “There are seventy-two
types of riba, the least of which is equivalent to a man committing incest
with his mother.” Narrated by al-Tabaraani in al-Awsat; classed as
saheeh by al-Albaani in Saheeh al-Jaami’, no. 3537. 

And the Prophet (blessings
and peace to Allaah be upon him) said: “A dirham of riba that a man consumed
knowingly is worse before Allaah then thirty-six acts of zina.” Narrated by
Ahmad and al-Tabaraani; classed as saheeh by al-Albaani in Saheeh
al-Jaami, no. 3375. 

This stern warning shakes the
heart of every believing man and woman, and prevents him or her from falling
into this grave sin. Allaah has threatened the one who consumes riba with
war, as He says (interpretation of the meaning): 

“O you who believe! Fear
Allaah and give up what remains (due to you) from Ribaa (from now onward) if
you are (really) believers.

279. And if you do not do
it, then take a notice of war from Allaah and His Messenger but if you
repent, you shall have your capital sums. Deal not unjustly (by asking more
than your capital sums), and you shall not be dealt with unjustly (by
receiving less than your capital sums)”

[al-Baqarah 2:278-279]

Who would want that for
himself, who is able for that?! 

Allaah tells us that riba
erases blessing and leads to bad consequences. He says (interpretation of
the meaning):

“Allaah will destroy Riba
and will give increase for Sadaqaat (deeds of charity, alms). And Allaah
likes not the disbelievers, sinners.

[al-Baqarah 2:276]

The Prophet (blessings and
peace of Allaah the upon him) told us that curses descend upon the one who
consumes riba, the one who pays it, the two who witness it and the one who
writes it down. Muslim (1598) narrated that Jaabir (may Allaah be pleased
with him) said: The Messenger of Allaah (peace and blessings of Allaah be
upon him) cursed the one who consumes riba and the one who pays it, the one
who writes it down and the two who witness it, and he said: they are all the
same. 

What is the value of money if
Allaah does not bless it and if curses descend upon its owner?! 

Hence we see many of those
who consume riba losing their wealth without benefitting from it, because
there is no blessing in it, as well as the feelings of worry, distress and
anxiety that they feel. This is one of the effects of sin, and the
punishment of the Hereafter is more severe and longer lasting. We ask Allaah
to keep us safe and sound. 

A wise person must be content
with that which is halaal and not to keep running after what is haraam,
because he will never get anything from it except loss and doom. 

May Allaah help us all to do
that which He loves and which pleases Him.  

And Allaah knows best.