How did the previous messengers call to faith in God, and what were their prayers and obligations before the Prophet, peace and blessings be upon him?

All messengers called for the unification of God and for Him alone to be worshipped, and they used various means to achieve this:

1. Perseverance in Conveying the Message: Exerting maximum effort in advising without slackening, as Noah (peace be upon him) did. 2. Kindness and Gentleness: Admonishing with goodness and speaking courteously, as God commanded Moses (peace be upon him) regarding Pharaoh. 3. Establishing Proofs: Presenting undeniable evidence for the validity of their call, such as Abraham's (peace be upon him) debates. 4. Patience in the Face of Harm: Enduring hardships for the sake of the call, as affirmed by His (the Almighty's) saying: "And indeed [other] messengers were denied before you, but they were patient over [the denial] and the harm they were subjected to until Our victory came to them." 5. Incentivizing and Warning: Giving glad tidings of Paradise to those who obey and warning of Hellfire to those who disobey.

As for their laws, God obligated them to prayer and fasting, but the Quran did not clarify to us the manner or specific amounts of these acts of worship, and it is not permissible to delve into what the Law has not clarified. The laws of nations differed, as He (the Almighty) said: "For each We have made from among you a law and a clear way."