7. Ensure that you do not give less than the amount that is obligatory upon you. Zakaat must be discharged after correctly calculating the amount that is due. Do not merely estimate the amount and discharge zakaat, as it is possible that you may estimate a lesser amount and fail to discharge your zakaat correctly. 

8. Refer to the Ulama to learn the correct method of calculating zakaat. ^[1]

^[1] وَمَا أَرْسَلْنَا مِنْ قَبْلِكَ إِلَّا رِجَالًا نُوحِيْ إِلَيْهِمْ فَاسْئَلُوْا أَهْلَ الذِّكْرِ إِنْ كُنْتُمْ لَا تَعْلَمُوْنَ (سورة النحل: 43)

The khutbah (sermon) which Rasulullah (sallallahu ‘alaihi wasallam) delivered on the occasion of the first Jumuah which he performed – the Jumu’ah in Banu Saalim - was such that its every word was saturated in eloquence, its every letter was a cure for spiritual maladies and a source of life for the spiritually dead hearts, and its every word was sweeter and more enjoyable than exquisite wine. The words of this khutbah are as follows:

(الحمد لله) أحمده وأستعينه وأستغفره وأستهديه وأؤمن به ولا أكفر وأعادي من يكفره

 “All praise is due to Allah. I glorify Him, I beseech His assistance, I beg His forgiveness and I plead to Him for His divine guidance. I bring imaan in Him and I do not disbelieve in Him, and (in fact,) I oppose those who disbelieve in Allah.”

On the occasion of the hijrah, Rasulullah (sallallahu ‘alaihi wasallam) arrived in Quba before coming to Madinah Munawwarah. Rasulullah (sallallahu ‘alaihi wasallam) stayed in Quba for a few days, after which he mounted his camel and departed for Madinah Munawwarah on a Friday.

On the road from Quba to Madinah Munawwarah lies the locality of Banu Saalim. Rasulullah (sallallahu ‘alaihi wasallam) reached Banu Saalim at the time of Jumu’ah, and hence Rasulullah (sallallahu ‘alaihi wasallam) performed the Jumu’ah here. This was the first Jumu’ah khutbah and Jumu’ah salaah which Rasulullah (sallallahu ‘alaihi wasallam) performed in Islam.